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base-scroll-api.html

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  1. <!DOCTYPE html>
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  3.   <head>
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  4.     <meta charset="utf-8">
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  6.     <title>API | BetterScroll 2.0</title>
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  18.     <link rel="preload" href="/docs/assets/css/0.styles.0cd93813.css" as="style"><link rel="preload" href="/docs/assets/js/app.c71b64d3.js" as="script"><link rel="preload" href="/docs/assets/js/5.d6412664.js" as="script"><link rel="preload" href="/docs/assets/js/4.4855b9ef.js" as="script"><link rel="preload" href="/docs/assets/js/3.481632b4.js" as="script"><link rel="preload" href="/docs/assets/js/102.79d86e3d.js" as="script"><link rel="preload" href="/docs/assets/js/7.518ccda7.js" as="script"><link rel="prefetch" href="/docs/assets/js/1.8644db92.js"><link rel="prefetch" href="/docs/assets/js/10.6f8c38eb.js"><link rel="prefetch" href="/docs/assets/js/100.ee08226e.js"><link rel="prefetch" href="/docs/assets/js/101.fd2f3d9f.js"><link rel="prefetch" href="/docs/assets/js/103.7a3ae3b5.js"><link rel="prefetch" href="/docs/assets/js/104.7be4589d.js"><link rel="prefetch" href="/docs/assets/js/105.75386d15.js"><link rel="prefetch" href="/docs/assets/js/106.a4a18e8d.js"><link 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    19. 

  19.     <link rel="stylesheet" href="/docs/assets/css/0.styles.0cd93813.css">
    20. 

  20.   </head>
    21. 

  21.   <body>
    22. 

  22.     <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/docs/zh-CN/" class="home-link router-link-active"><img src="https://dpubstatic.udache.com/static/dpubimg/t_L6vAgQ-E/logo.svg" alt="BetterScroll 2.0" class="logo"> <span class="site-name can-hide">BetterScroll 2.0</span></a> <div class="links"><form id="search-form" role="search" class="algolia-search-wrapper search-box"><input id="algolia-search-input" class="search-query"></form> <nav class="nav-links can-hide"><div class="nav-item"><a href="/docs/zh-CN/guide/" class="nav-link router-link-active">
    23. 

  23.   指南
    24. 

  24. </a></div><div class="nav-item"><a href="/docs/zh-CN/plugins/" class="nav-link">
    25. 

  25.   插件
    26. 

  26. </a></div><div class="nav-item"><a href="/docs/zh-CN/FAQ/" class="nav-link">
    27. 

  27.   常见问题
    28. 

  28. </a></div><div class="nav-item"><a href="https://github.com/ustbhuangyi/better-scroll/issues" target="_blank" rel="noopener noreferrer" class="nav-link external">
    29. 

  29.   讨论
    30. 

  30.   <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="Select language" class="dropdown-title"><span class="title">选择语言</span> <span class="arrow down"></span></button> <button type="button" aria-label="Select language" class="mobile-dropdown-title"><span class="title">选择语言</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/docs/en-US/guide/base-scroll-api.html" class="nav-link">
    31. 

  31.   English
    32. 

  32. </a></li><li class="dropdown-item"><!----> <a href="/docs/zh-CN/guide/base-scroll-api.html" aria-current="page" class="nav-link router-link-exact-active router-link-active">
    33. 

  33.   简体中文
    34. 

  34. </a></li></ul></div></div> <a href="https://github.com/ustbhuangyi/better-scroll" target="_blank" rel="noopener noreferrer" class="repo-link">
    35. 

  35.     GitHub
    36. 

  36.     <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><a href="/docs/zh-CN/guide/" class="nav-link router-link-active">
    37. 

  37.   指南
    38. 

  38. </a></div><div class="nav-item"><a href="/docs/zh-CN/plugins/" class="nav-link">
    39. 

  39.   插件
    40. 

  40. </a></div><div class="nav-item"><a href="/docs/zh-CN/FAQ/" class="nav-link">
    41. 

  41.   常见问题
    42. 

  42. </a></div><div class="nav-item"><a href="https://github.com/ustbhuangyi/better-scroll/issues" target="_blank" rel="noopener noreferrer" class="nav-link external">
    43. 

  43.   讨论
    44. 

  44.   <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="Select language" class="dropdown-title"><span class="title">选择语言</span> <span class="arrow down"></span></button> <button type="button" aria-label="Select language" class="mobile-dropdown-title"><span class="title">选择语言</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/docs/en-US/guide/base-scroll-api.html" class="nav-link">
    45. 

  45.   English
    46. 

  46. </a></li><li class="dropdown-item"><!----> <a href="/docs/zh-CN/guide/base-scroll-api.html" aria-current="page" class="nav-link router-link-exact-active router-link-active">
    47. 

  47.   简体中文
    48. 

  48. </a></li></ul></div></div> <a href="https://github.com/ustbhuangyi/better-scroll" target="_blank" rel="noopener noreferrer" class="repo-link">
    49. 

  49.     GitHub
    50. 

  50.     <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>指南</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/zh-CN/guide/" aria-current="page" class="sidebar-link">介绍</a></li><li><a href="/docs/zh-CN/guide/how-to-install.html" class="sidebar-link">安装</a></li><li><a href="/docs/zh-CN/guide/use.html" class="sidebar-link">使用</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>核心滚动</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/zh-CN/guide/base-scroll.html" class="sidebar-link">核心滚动</a></li><li><a href="/docs/zh-CN/guide/base-scroll-options.html" class="sidebar-link">配置项</a></li><li><a href="/docs/zh-CN/guide/base-scroll-api.html" aria-current="page" class="active sidebar-link">API</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/docs/zh-CN/guide/base-scroll-api.html#属性" class="sidebar-link">属性</a></li><li class="sidebar-sub-header"><a href="/docs/zh-CN/guide/base-scroll-api.html#方法" class="sidebar-link">方法</a></li><li class="sidebar-sub-header"><a href="/docs/zh-CN/guide/base-scroll-api.html#事件-vs-钩子" class="sidebar-link">事件 VS 钩子</a></li><li class="sidebar-sub-header"><a href="/docs/zh-CN/guide/base-scroll-api.html#事件" class="sidebar-link">事件</a></li><li class="sidebar-sub-header"><a href="/docs/zh-CN/guide/base-scroll-api.html#钩子" class="sidebar-link">钩子</a></li></ul></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="api"><a href="#api" class="header-anchor">#</a> API</h1> <p>如果想要彻底了解 BetterScroll，就需要了解其实例的常用属性、灵活的方法以及提供的事件与钩子。</p> <h2 id="属性"><a href="#属性" class="header-anchor">#</a> 属性</h2> <p>有时候我们想基于 BetterScroll 做一些扩展，需要对 BetterScroll 的一些属性有所了解，下面介绍几个常用属性。</p> <h3 id="x"><a href="#x" class="header-anchor">#</a> x</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：bs 横轴坐标。</li></ul> <h3 id="y"><a href="#y" class="header-anchor">#</a> y</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：bs 纵轴坐标。</li></ul> <h3 id="maxscrollx"><a href="#maxscrollx" class="header-anchor">#</a> maxScrollX</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：bs 最大横向滚动位置。</li> <li><strong>备注</strong>：bs 横向滚动的位置区间是 [minScrollX, maxScrollX]，并且 maxScrollX 是负值。</li></ul> <h3 id="minscrollx"><a href="#minscrollx" class="header-anchor">#</a> minScrollX</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：bs 最小横向滚动位置。</li> <li><strong>备注</strong>：bs 横向滚动的位置区间是 [minScrollX, maxScrollX]，并且 minScrollX 是正值。</li></ul> <h3 id="maxscrolly"><a href="#maxscrolly" class="header-anchor">#</a> maxScrollY</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：bs 最大纵向滚动位置。</li> <li><strong>备注</strong>：bs 纵向滚动的位置区间是 [minScrollY, maxScrollY]，并且 maxScrollY 是负值。</li></ul> <h3 id="minscrolly"><a href="#minscrolly" class="header-anchor">#</a> minScrollY</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：bs 最小纵向滚动位置。</li> <li><strong>备注</strong>：bs 纵向滚动的位置区间是 [minScrollY, maxScrollY]，并且 minScrollY 是正值。</li></ul> <h3 id="movingdirectionx"><a href="#movingdirectionx" class="header-anchor">#</a> movingDirectionX</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：判断 bs 滑动过程中的方向（左右）。</li> <li><strong>备注</strong>：-1 表示手指从左向右滑，1 表示从右向左滑，0 表示没有滑动。</li></ul> <h3 id="movingdirectiony"><a href="#movingdirectiony" class="header-anchor">#</a> movingDirectionY</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：判断 bs 滑动过程中的方向（上下）。</li> <li><strong>备注</strong>：-1 表示手指从上往下滑，1 表示从下往上滑，0 表示没有滑动。</li></ul> <h3 id="directionx"><a href="#directionx" class="header-anchor">#</a> directionX</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：判断 bs 滑动结束后相对于开始滑动位置的方向（左右）。</li> <li><strong>备注</strong>：-1 表示手指从左向右滑，1 表示从右向左滑，0 表示没有滑动。</li></ul> <h3 id="directiony"><a href="#directiony" class="header-anchor">#</a> directionY</h3> <ul><li><strong>类型</strong>：number</li> <li><strong>作用</strong>：判断 bs 滑动结束后相对于开始滑动位置的方向（上下）。</li> <li><strong>备注</strong>：-1 表示手指从上往下滑，1 表示从下往上滑，0 表示没有滑动。</li></ul> <h3 id="enabled"><a href="#enabled" class="header-anchor">#</a> enabled</h3> <ul><li><strong>类型</strong>：boolean,</li> <li><strong>作用</strong>：判断当前 bs 是否处于启用状态，不再响应手指的操作。</li></ul> <h3 id="pending"><a href="#pending" class="header-anchor">#</a> pending</h3> <ul><li><strong>类型</strong>：boolean,</li> <li><strong>作用</strong>：判断当前 bs 是否处于滚动动画过程中。</li></ul> <h2 id="方法"><a href="#方法" class="header-anchor">#</a> 方法</h2> <p>BetterScroll 提供了很多灵活的 API，当我们基于 BetterScroll 去实现一些 feature 的时候，会用到这些 API，了解它们会有助于开发更加复杂的需求。</p> <h3 id="refresh"><a href="#refresh" class="header-anchor">#</a> refresh()</h3> <ul><li><strong>参数</strong>：无</li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：重新计算 BetterScroll，当 DOM 结构发生变化的时候务必要调用确保滚动的效果正常。</li></ul> <h3 id="scrollto-x-y-time-easing-extratransform"><a href="#scrollto-x-y-time-easing-extratransform" class="header-anchor">#</a> scrollTo(x, y, time, easing, extraTransform)</h3> <ul><li><strong>参数</strong>：
    51. 

  51. <ul><li>{number} x 横轴坐标（单位 px）</li> <li>{number} y 纵轴坐标（单位 px）</li> <li>{number} time 滚动动画执行的时长（单位 ms）</li> <li>{Object} easing 缓动函数，一般不建议修改，如果想修改，参考源码中的 <code>packages/shared-utils/src/ease.ts</code> 里的写法</li> <li>{Object} extraTransform，只有在你想要修改 CSS transform 的一些其他属性的时候，你才需要传入此参数，结构如下：</li></ul> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">let</span> extraTransform <span class="token operator">=</span> <span class="token punctuation">{</span>
    52. 

  52.   <span class="token comment">// 起点的属性</span>
    53. 

  53.   <span class="token literal-property property">start</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    54. 

  54.     <span class="token literal-property property">scale</span><span class="token operator">:</span> <span class="token number">0</span>
    55. 

  55.   <span class="token punctuation">}</span><span class="token punctuation">,</span>
    56. 

  56.   <span class="token comment">// 终点的属性</span>
    57. 

  57.   <span class="token literal-property property">end</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    58. 

  58.     <span class="token literal-property property">scale</span><span class="token operator">:</span> <span class="token number">1.1</span>
    59. 

  59.   <span class="token punctuation">}</span>
    60. 

  60. <span class="token punctuation">}</span>
    61. 

  61. bs<span class="token punctuation">.</span><span class="token function">scrollTo</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">60</span><span class="token punctuation">,</span> <span class="token number">300</span><span class="token punctuation">,</span> <span class="token keyword">undefined</span><span class="token punctuation">,</span> extraTransform<span class="token punctuation">)</span>
    62. 

  62. </code></pre></div></li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：滚动到指定的 x,y 位置。</li></ul> <h3 id="scrollby-x-y-time-easing"><a href="#scrollby-x-y-time-easing" class="header-anchor">#</a> scrollBy(x, y, time, easing)</h3> <ul><li><strong>参数</strong>：
    63. 

  63. <ul><li>{number} x 横轴变化量（单位 px）</li> <li>{number} y 纵轴变化量（单位 px）</li> <li>{number} time 滚动动画执行的时长（单位 ms）</li> <li>{Object} easing 缓动函数，一般不建议修改，如果想修改，参考源码中的 <code>packages/shared-utils/src/ease.ts</code> 里的写法</li></ul></li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：相对于当前位置偏移滚动 x,y 的距离。</li></ul> <h3 id="scrolltoelement-el-time-offsetx-offsety-easing"><a href="#scrolltoelement-el-time-offsetx-offsety-easing" class="header-anchor">#</a> scrollToElement(el, time, offsetX, offsetY, easing)</h3> <ul><li><strong>参数</strong>：
    64. 

  64. <ul><li>{DOM | string} el 滚动到的目标元素, 如果是字符串，则内部会尝试调用 querySelector 转换成 DOM 对象。</li> <li>{number} time 滚动动画执行的时长（单位 ms）</li> <li>{number | boolean} offsetX 相对于目标元素的横轴偏移量，如果设置为 true，则滚到目标元素的中心位置</li> <li>{number | boolean} offsetY 相对于目标元素的纵轴偏移量，如果设置为 true，则滚到目标元素的中心位置</li> <li>{Object} easing 缓动函数，一般不建议修改，如果想修改，参考源码中的 <code>packages/shared-utils/src/ease.ts</code> 里的写法</li></ul></li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：滚动到指定的目标元素。</li></ul> <h3 id="stop"><a href="#stop" class="header-anchor">#</a> stop()</h3> <ul><li><strong>参数</strong>：无</li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：立即停止当前运行的滚动动画。</li></ul> <h3 id="enable"><a href="#enable" class="header-anchor">#</a> enable()</h3> <ul><li><strong>参数</strong>：无</li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：启用 BetterScroll, 默认 开启。</li></ul> <h3 id="disable"><a href="#disable" class="header-anchor">#</a> disable()</h3> <ul><li><strong>参数</strong>：无</li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：禁用 BetterScroll，DOM 事件（如 touchstart、touchmove、touchend）的回调函数不再响应。</li></ul> <h3 id="destroy"><a href="#destroy" class="header-anchor">#</a> destroy()</h3> <ul><li><strong>参数</strong>：无</li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：销毁 BetterScroll，解绑事件。</li></ul> <h3 id="on-type-fn-context"><a href="#on-type-fn-context" class="header-anchor">#</a> on(type, fn, context)</h3> <ul><li><strong>参数</strong>：
    65. 

  65. <ul><li>{string} type 事件名</li> <li>{Function} fn 回调函数</li> <li>{Object} context 函数执行的上下文环境，默认是 this</li></ul></li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：监听当前实例上的钩子函数。如：scroll、scrollEnd 等。</li> <li><strong>示例</strong>：</li></ul> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    66. 

  66. <span class="token keyword">let</span> scroll <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    67. 

  67.   <span class="token literal-property property">probeType</span><span class="token operator">:</span> <span class="token number">3</span>
    68. 

  68. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    69. 

  69. <span class="token keyword">function</span> <span class="token function">onScroll</span><span class="token punctuation">(</span><span class="token parameter">pos</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    70. 

  70.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Now position is x: </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>pos<span class="token punctuation">.</span>x<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">, y: </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>pos<span class="token punctuation">.</span>y<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
    71. 

  71. <span class="token punctuation">}</span>
    72. 

  72. scroll<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scroll'</span><span class="token punctuation">,</span> onScroll<span class="token punctuation">)</span>
    73. 

  73. </code></pre></div><h3 id="once-type-fn-context"><a href="#once-type-fn-context" class="header-anchor">#</a> once(type, fn, context)</h3> <ul><li><strong>参数</strong>：
    74. 

  74. <ul><li>{string} type 事件名</li> <li>{Function} fn 回调函数</li> <li>{Object} context 函数执行的上下文环境，默认是 this</li></ul></li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：监听一个自定义事件，但是只触发一次，在第一次触发之后移除监听器。</li></ul> <h3 id="off-type-fn"><a href="#off-type-fn" class="header-anchor">#</a> off(type, fn)</h3> <ul><li><strong>参数</strong>：
    75. 

  75. <ul><li>{string} type 事件名</li> <li>{Function} fn 回调函数</li></ul></li> <li><strong>返回值</strong>：无</li> <li><strong>作用</strong>：移除自定义事件监听器。只会移除这个回调的监听器。</li> <li><strong>示例</strong>：</li></ul> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    76. 

  76. <span class="token keyword">let</span> scroll <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    77. 

  77.   <span class="token literal-property property">probeType</span><span class="token operator">:</span> <span class="token number">3</span>
    78. 

  78. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    79. 

  79. <span class="token keyword">function</span> <span class="token function">handler</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    80. 

  80.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'bs is scrolling now'</span><span class="token punctuation">)</span>
    81. 

  81. <span class="token punctuation">}</span>
    82. 

  82. scroll<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scroll'</span><span class="token punctuation">,</span> handler<span class="token punctuation">)</span>
    83. 

  83. 

  84. scroll<span class="token punctuation">.</span><span class="token function">off</span><span class="token punctuation">(</span><span class="token string">'scroll'</span><span class="token punctuation">,</span> handler<span class="token punctuation">)</span>
    85. 

  85. </code></pre></div><h2 id="事件-vs-钩子"><a href="#事件-vs-钩子" class="header-anchor">#</a> 事件 VS 钩子</h2> <p>基于 2.x 的架构设计，以及对 1.x 事件的兼容，我们延伸出两个概念 ——『<strong>事件</strong>』以及『<strong>钩子</strong>』。从本源上来说它们都是属于 <code>EventEmitter</code> 实例，只是叫法不一样。下面我们从节选的源码来讲解一下：</p> <div class="language-typescript extra-class"><pre class="language-typescript"><code>  <span class="token keyword">export</span> <span class="token keyword">default</span> BScrollCore <span class="token keyword">extends</span> <span class="token class-name">EventEmitter</span> <span class="token punctuation">{</span>
    86. 

  86.     hooks<span class="token operator">:</span> EventEmitter
    87. 

  87.   <span class="token punctuation">}</span>
    88. 

  88. </code></pre></div><ul><li><p><strong>BScrollCore</strong></p> <p>本身继承了 EventEmitter。它派发出来的，我们都称之为『<strong>事件</strong>』。</p> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    89. 

  89.   <span class="token keyword">let</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    90. 

  90. 

  91.   <span class="token comment">// 监听 bs 的 scroll 事件</span>
    92. 

  92.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scroll'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    93. 

  93.   <span class="token comment">// 监听 bs 的 refresh 事件</span>
    94. 

  94.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'refresh'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    95. 

  95. </code></pre></div></li> <li><p><strong>BScrollCore.hooks</strong></p> <p>hooks 也是 EventEmitter 的实例。它派发出来的，我们都称之为『<strong>钩子</strong>』。</p> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    96. 

  96.   <span class="token keyword">let</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    97. 

  97. 

  98.   <span class="token comment">// 监听 bs 的 refresh 钩子</span>
    99. 

  99.   bs<span class="token punctuation">.</span>hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'refresh'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    100. 

  100.   <span class="token comment">// 监听 bs 的 enable 钩子</span>
    101. 

  101.   bs<span class="token punctuation">.</span>hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'enable'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    102. 

  102. </code></pre></div></li></ul> <p>相信现在大家对两者有了更好的区分吧，『<strong>事件</strong>』是为了 1.x 的兼容考虑，用户一般关注的是事件的派发，但是如果要编写一款插件，你应该更加关注『<strong>钩子</strong>』。</p> <h2 id="事件"><a href="#事件" class="header-anchor">#</a> 事件</h2> <p>在 2.0 当中，BetterScroll 事件与 1.x 的事件是拉齐的，只有 BetterScroll 会派发『<strong>事件</strong>』，如果你在编写插件的时候需要暴露事件，你也应该通过 BetterScroll 来派发，<a href="/docs/zh-CN/plugins/how-to-write.html">详细的教程看这</a>，目前的事件分为下面几种：</p> <ul><li><p><strong>refresh</strong></p> <ul><li><strong>触发时机</strong>：BetterScroll 重新计算</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BetterScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    103. 

  103. 

  104.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BetterScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    105. 

  105. 

  106.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'refresh'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    107. 

  107. </code></pre></div></li> <li><p><strong>enable</strong></p> <ul><li><strong>触发时机</strong>：BetterScroll 启用，开始响应用户交互</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'enable'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    108. 

  108. </code></pre></div></li> <li><p><strong>disable</strong></p> <ul><li><strong>触发时机</strong>：BetterScroll 禁用，不再响应用户交互</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'disable'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    109. 

  109. </code></pre></div></li> <li><p><strong>beforeScrollStart</strong></p> <ul><li><strong>触发时机</strong>：用户手指放在滚动区域的时候</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeScrollStart'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    110. 

  110. </code></pre></div></li> <li><p><strong>scrollStart</strong></p> <ul><li><strong>触发时机</strong>：content 元素满足滚动条件，即将开始滚动</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scrollStart'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    111. 

  111. </code></pre></div></li> <li><p><strong>scroll</strong></p> <ul><li><strong>触发时机</strong>：正在滚动</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scroll'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">position</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    112. 

  112.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>position<span class="token punctuation">.</span>x<span class="token punctuation">,</span> position<span class="token punctuation">.</span>y<span class="token punctuation">)</span>
    113. 

  113.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    114. 

  114. </code></pre></div></li> <li><p><strong>scrollEnd</strong></p> <ul><li><strong>触发时机</strong>：滚动结束，或者让一个正在滚动的 content 强制停止</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scrollEnd'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    115. 

  115. </code></pre></div></li> <li><p><strong>scrollCancel</strong></p> <ul><li><strong>触发时机</strong>：滚动取消</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scrollCancel'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    116. 

  116. </code></pre></div></li> <li><p><strong>touchEnd</strong></p> <ul><li><strong>触发时机</strong>：用户手指离开滚动区域</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'touchEnd'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    117. 

  117. </code></pre></div></li> <li><p><strong>flick</strong></p> <ul><li><strong>触发时机</strong>：用户触发轻拂操作</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'flick'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    118. 

  118. </code></pre></div></li> <li><p><strong>destroy</strong></p> <ul><li><strong>触发时机</strong>：BetterScroll 销毁</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'destroy'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    119. 

  119. </code></pre></div></li> <li><p><strong>contentChanged</strong> <span class="badge tip" style="vertical-align:top;" data-v-15b7b770>2.0.4</span></p> <ul><li><strong>触发时机</strong>：在调用 <code>bs.refresh()</code>，探测到 content DOM 变成了其他元素的时候</li></ul> <div class="language-typescript extra-class"><pre class="language-typescript"><code>  <span class="token comment">// bs 版本 &gt;= 2.0.4</span>
    120. 

  120.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'contentChanged'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>newContent<span class="token operator">:</span> HTMLElement<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    121. 

  121. </code></pre></div></li></ul> <p>以下的事件必须注册括号中的<strong>插件</strong>才会派发：</p> <ul><li><p><strong>alterOptions(<strong>mouse-wheel</strong>)</strong></p> <ul><li><strong>触发时机</strong>：滚轮滚动开始</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BetterScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    122. 

  122.   <span class="token keyword">import</span> MouseWheel <span class="token keyword">from</span> <span class="token string">'@better-scroll/mouse-wheel'</span>
    123. 

  123. 

  124.   BetterScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>MouseWheel<span class="token punctuation">)</span>
    125. 

  125.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BetterScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    126. 

  126.     <span class="token literal-property property">mouseWheel</span><span class="token operator">:</span> <span class="token boolean">true</span>
    127. 

  127.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    128. 

  128. 

  129.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'alterOptions'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">mouseWheelOptions</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    130. 

  130.     <span class="token comment">/**
    131. 

  131.      * mouseWheelOptions.speed：鼠标滚轮滚动的速度
    132. 

  132.      * mouseWheelOptions.invert：滚轮滚动和 BetterScroll 滚动的方向是否一致
    133. 

  133.      * mouseWheelOptions.easeTime：滚动动画的缓动时长。
    134. 

  134.      * mouseWheelOptions.discreteTime：触发 wheelEnd 的间隔时长
    135. 

  135.      * mouseWheelOptions.throttleTime：滚轮滚动是高频率的动作，因此可以通过 throttleTime 来限制触发频率
    136. 

  136.      * mouseWheelOptions.dampingFactor：阻尼因子，当超出边界会施加阻力
    137. 

  137.      **/</span>
    138. 

  138.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    139. 

  139. </code></pre></div></li> <li><p><strong>mousewheelStart(<strong>mouse-wheel</strong>)</strong></p> <ul><li><strong>触发时机</strong>：滚轮滚动开始</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BetterScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    140. 

  140.   <span class="token keyword">import</span> MouseWheel <span class="token keyword">from</span> <span class="token string">'@better-scroll/mouse-wheel'</span>
    141. 

  141. 

  142.   BetterScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>MouseWheel<span class="token punctuation">)</span>
    143. 

  143.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BetterScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    144. 

  144.     <span class="token literal-property property">mouseWheel</span><span class="token operator">:</span> <span class="token boolean">true</span>
    145. 

  145.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    146. 

  146. 

  147.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'mousewheelStart'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    148. 

  148. </code></pre></div></li> <li><p><strong>mousewheelMove(<strong>mouse-wheel</strong>)</strong></p> <ul><li><strong>触发时机</strong>：滚轮滚动中</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'mousewheelMove'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    149. 

  149. </code></pre></div></li> <li><p><strong>mousewheelEnd(<strong>mouse-wheel</strong>)</strong></p> <ul><li><strong>触发时机</strong>：滚轮滚动结束</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'mousewheelEnd'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    150. 

  150. </code></pre></div></li> <li><p><strong>pullingDown(<strong>pull-down</strong>)</strong></p> <ul><li><strong>触发时机</strong>：当顶部下拉距离超过阈值</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BetterScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    151. 

  151.   <span class="token keyword">import</span> Pulldown <span class="token keyword">from</span> <span class="token string">'@better-scroll/pull-down'</span>
    152. 

  152. 

  153.   BetterScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>Pulldown<span class="token punctuation">)</span>
    154. 

  154.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BetterScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    155. 

  155.     <span class="token literal-property property">pullDownRefresh</span><span class="token operator">:</span> <span class="token boolean">true</span>
    156. 

  156.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    157. 

  157. 

  158.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'pullingDown'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    159. 

  159.     <span class="token keyword">await</span> <span class="token function">fetchData</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    160. 

  160.     bs<span class="token punctuation">.</span><span class="token function">finishPullDown</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    161. 

  161.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    162. 

  162. </code></pre></div></li> <li><p><strong>pullingUp(<strong>pull-up</strong>)</strong></p> <ul><li><strong>触发时机</strong>：当底部下拉距离超过阈值</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BetterScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    163. 

  163.   <span class="token keyword">import</span> Pullup <span class="token keyword">from</span> <span class="token string">'@better-scroll/pull-up'</span>
    164. 

  164. 

  165.   BetterScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>Pullup<span class="token punctuation">)</span>
    166. 

  166.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BetterScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    167. 

  167.     <span class="token literal-property property">pullUpLoad</span><span class="token operator">:</span> <span class="token boolean">true</span>
    168. 

  168.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    169. 

  169. 

  170.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'pullingUp'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    171. 

  171.     <span class="token keyword">await</span> <span class="token function">fetchData</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    172. 

  172.     bs<span class="token punctuation">.</span><span class="token function">finishPullUp</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    173. 

  173.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    174. 

  174. </code></pre></div></li> <li><p><strong>slideWillChange(<strong>slide</strong>)</strong></p> <ul><li><strong>触发时机</strong>：轮播图即将要切换 Page</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BetterScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    175. 

  175.   <span class="token keyword">import</span> Slide <span class="token keyword">from</span> <span class="token string">'@better-scroll/slide'</span>
    176. 

  176. 

  177.   BetterScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>Slide<span class="token punctuation">)</span>
    178. 

  178. 

  179.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BetterScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    180. 

  180.     <span class="token literal-property property">slide</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
    181. 

  181.     <span class="token literal-property property">momentum</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
    182. 

  182.     <span class="token literal-property property">bounce</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
    183. 

  183.     <span class="token literal-property property">probeType</span><span class="token operator">:</span> <span class="token number">2</span>
    184. 

  184.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    185. 

  185. 

  186.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'slideWillChange'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">page</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    187. 

  187.     <span class="token comment">// 即将要切换的页面</span>
    188. 

  188.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>page<span class="token punctuation">.</span>pageX<span class="token punctuation">,</span> page<span class="token punctuation">.</span>pageY<span class="token punctuation">)</span>
    189. 

  189.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    190. 

  190. </code></pre></div></li> <li><p><strong>beforeZoomStart(<strong>zoom</strong>)</strong></p> <ul><li><strong>触发时机</strong>：双指接触缩放元素时</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BetterScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    191. 

  191.   <span class="token keyword">import</span> Zoom <span class="token keyword">from</span> <span class="token string">'@better-scroll/zoom'</span>
    192. 

  192. 

  193.   BetterScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>Zoom<span class="token punctuation">)</span>
    194. 

  194. 

  195.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BetterScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    196. 

  196.     <span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token boolean">true</span>
    197. 

  197.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    198. 

  198. 

  199.   bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeZoomStart'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    200. 

  200. </code></pre></div></li> <li><p><strong>zoomStart(<strong>zoom</strong>)</strong></p> <ul><li><strong>触发时机</strong>：双指缩放距离超过最小阈值</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'zoomStart'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    201. 

  201. </code></pre></div></li> <li><p><strong>zooming(<strong>zoom</strong>)</strong></p> <ul><li><strong>触发时机</strong>：双指缩放行为正在进行时</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'zooming'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> scale <span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    202. 

  202.     <span class="token comment">// scale 当前 scale</span>
    203. 

  203.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    204. 

  204. </code></pre></div></li> <li><p><strong>zoomEnd(<strong>zoom</strong>)</strong></p> <ul><li><strong>触发时机</strong>：双指缩放行为结束后</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'zoomEnd'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> scale <span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    205. 

  205. </code></pre></div></li></ul> <h2 id="钩子"><a href="#钩子" class="header-anchor">#</a> 钩子</h2> <p>钩子是 2.0 版本延伸出来的概念，它的本质与事件相同，都是 EventEmitter 实例，也就是典型的订阅发布模式。BScrollCore 作为一个最小的滚动单元，内部也是存在非常多的功能类，每个功能类都有一个叫 hooks 的属性，它架起了不同类之间沟通的桥梁。如果你要编写一个复杂的插件，钩子是必须需要掌握的内容。</p> <ul><li><p><strong>BScrollCore.hooks</strong></p> <ul><li><p><strong>beforeInitialScrollTo</strong></p> <ul><li><strong>触发时机</strong>：初始化加载完插件，需要滚动到指定位置</li> <li><strong>参数</strong>：position 对象
    206. 

  206. <ul><li><code>{ x: number, y: number }</code></li></ul></li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    207. 

  207.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    208. 

  208.   bs<span class="token punctuation">.</span>hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeInitialScrollTo'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">postion</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    209. 

  209.     postion<span class="token punctuation">.</span>x <span class="token operator">=</span> <span class="token number">0</span>
    210. 

  210.     position<span class="token punctuation">.</span>y <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">200</span> <span class="token comment">// 初始化滚动至 -200 的位置</span>
    211. 

  211.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    212. 

  212. </code></pre></div></li> <li><p><strong>refresh</strong></p> <ul><li><strong>触发时机</strong>：重新计算 BetterScroll</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    213. 

  213.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    214. 

  214.   bs<span class="token punctuation">.</span>hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'refresh'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'refreshed'</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    215. 

  215. </code></pre></div></li> <li><p><strong>enable</strong></p> <ul><li><strong>触发时机</strong>：启用 BetterScroll，响应用户行为</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    216. 

  216.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    217. 

  217.   bs<span class="token punctuation">.</span>hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'enable'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'enabled'</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    218. 

  218. </code></pre></div></li> <li><p><strong>disable</strong></p> <ul><li><strong>触发时机</strong>：禁用 BetterScroll，不再响应用户行为</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    219. 

  219.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    220. 

  220.   bs<span class="token punctuation">.</span>hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'disable'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'disabled'</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    221. 

  221. </code></pre></div></li> <li><p><strong>destroy</strong></p> <ul><li><strong>触发时机</strong>：销毁 BetterScroll</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    222. 

  222.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    223. 

  223.   bs<span class="token punctuation">.</span>hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'destroy'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'destroyed'</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    224. 

  224. </code></pre></div></li> <li><p><strong>contentChanged</strong> <span class="badge tip" style="vertical-align:top;" data-v-15b7b770>2.0.4</span></p> <ul><li><strong>触发时机</strong>：在调用 <code>bs.refresh()</code>，探测到 content DOM 变成了其他元素的时候</li> <li><strong>示例</strong></li></ul> <div class="language-typescript extra-class"><pre class="language-typescript"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    225. 

  225.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    226. 

  226.   <span class="token comment">// bs 版本 &gt;= 2.0.4</span>
    227. 

  227.   bs<span class="token punctuation">.</span>hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'contentChanged'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>newContent<span class="token operator">:</span> HTMLElement<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>newContent<span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    228. 

  228. </code></pre></div></li></ul></li> <li><p><strong>ActionsHandler.hooks</strong></p> <ul><li><p><strong>beforeStart</strong></p> <ul><li><strong>触发时机</strong>：刚响应 touchstart 事件，还未记录手指在屏幕点击的位置</li> <li><strong>参数</strong>：event 事件对象</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    229. 

  229.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    230. 

  230.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actionsHandler<span class="token punctuation">.</span>hooks
    231. 

  231.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeStart'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">event</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>target<span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    232. 

  232. </code></pre></div></li> <li><p><strong>start</strong></p> <ul><li><strong>触发时机</strong>：记录完手指在屏幕点击的位置，即将触发 touchmove</li> <li><strong>参数</strong>：event 事件对象</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    233. 

  233.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    234. 

  234.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actionsHandler<span class="token punctuation">.</span>hooks
    235. 

  235.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'start'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">event</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>target<span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    236. 

  236. </code></pre></div></li> <li><p><strong>move</strong></p> <ul><li><strong>触发时机</strong>：响应 touchmove 事件，记录完手指在屏幕点击的位置</li> <li><strong>参数</strong>：拥有如下属性的对象
    237. 

  237. <ul><li><code>{ number } deltaX</code>：x 方向的手指偏移量</li> <li><code>{ number } deltaY</code>：y 方向的手指偏移量</li> <li><code>{ event } e</code>：event 事件对象</li></ul></li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    238. 

  238.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    239. 

  239.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actionsHandler<span class="token punctuation">.</span>hooks
    240. 

  240.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'move'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> deltaX<span class="token punctuation">,</span> deltaY<span class="token punctuation">,</span> e <span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    241. 

  241. </code></pre></div></li> <li><p><strong>end</strong></p> <ul><li><strong>触发时机</strong>：响应 touchend 事件</li> <li><strong>参数</strong>：event 事件对象</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    242. 

  242.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    243. 

  243.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actionsHandler<span class="token punctuation">.</span>hooks
    244. 

  244.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'end'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">event</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    245. 

  245. </code></pre></div></li> <li><p><strong>click</strong></p> <ul><li><strong>触发时机</strong>：触发 click 事件</li> <li><strong>参数</strong>：event 事件对象</li></ul></li></ul></li> <li><p><strong>ScrollerActions.hooks</strong></p> <ul><li><p><strong>start</strong></p> <ul><li><strong>触发时机</strong>：记录完所有的滚动初始信息</li> <li><strong>参数</strong>：event 事件对象</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    246. 

  246.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    247. 

  247.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actions<span class="token punctuation">.</span>hooks
    248. 

  248.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'start'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">event</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>target<span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    249. 

  249. </code></pre></div></li> <li><p><strong>beforeMove</strong></p> <ul><li><strong>触发时机</strong>：在检验是否是合法的滚动之前</li> <li><strong>参数</strong>：event 事件对象</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    250. 

  250.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    251. 

  251.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actions<span class="token punctuation">.</span>hooks
    252. 

  252.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeMove'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">event</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>target<span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    253. 

  253. </code></pre></div></li> <li><p><strong>scrollStart</strong></p> <ul><li><strong>触发时机</strong>：校验是合法的滚动，并且即将开始滚动</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    254. 

  254.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    255. 

  255.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actions<span class="token punctuation">.</span>hooks
    256. 

  256.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scrollStart'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    257. 

  257. </code></pre></div></li> <li><p><strong>scroll</strong></p> <ul><li><strong>触发时机</strong>：正在滚动</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    258. 

  258.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    259. 

  259.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actions<span class="token punctuation">.</span>hooks
    260. 

  260.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scroll'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    261. 

  261. </code></pre></div></li> <li><p><strong>beforeEnd</strong></p> <ul><li><strong>触发时机</strong>：刚执行 touchend 事件回调，但是还未更新最终位置</li> <li><strong>参数</strong>：event 事件对象</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    262. 

  262.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    263. 

  263.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actions<span class="token punctuation">.</span>hooks
    264. 

  264.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeEnd'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">event</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>event<span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    265. 

  265. </code></pre></div></li> <li><p><strong>end</strong></p> <ul><li><strong>触发时机</strong>：刚执行 touchend 事件回调并且更新滚动方向</li> <li><strong>参数</strong>：两个参数，第一个是 event 事件对象，第二个是当前位置
    266. 

  266. <ul><li><code>{ event } e</code>：事件对象</li> <li><code>{ x: number, y: number } postion</code>：当前位置</li></ul></li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    267. 

  267.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    268. 

  268.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actions<span class="token punctuation">.</span>hooks
    269. 

  269.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'end'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">e<span class="token punctuation">,</span> postion</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    270. 

  270. </code></pre></div></li> <li><p><strong>scrollEnd</strong></p> <ul><li><strong>触发时机</strong>：滚动即将结束，但还需要校验一次滚动行为是否触发了 flick、momentum 行为。</li> <li><strong>参数</strong>：两个参数，第一个是当前位置，第二个是动画时长
    271. 

  271. <ul><li><code>{ x: number, y: number } postion</code>：当前位置</li> <li><code>{ number } duration</code>：动画时长</li></ul></li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    272. 

  272.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    273. 

  273.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actions<span class="token punctuation">.</span>hooks
    274. 

  274.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeEnd'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">pos<span class="token punctuation">,</span> duration</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>pos<span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    275. 

  275. </code></pre></div></li> <li><p><strong>coordinateTransformation</strong> <span class="badge tip" style="vertical-align:top;" data-v-15b7b770>2.3.0</span></p> <ul><li><strong>触发时机</strong>：计算完用户手指的偏移量之后，发生滚动之前。</li> <li><strong>参数</strong>：
    276. 

  276. <ul><li><code>{ deltaX: number, deltaY: number } transformateDeltaData</code>：偏移量对象</li></ul></li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    277. 

  277.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    278. 

  278.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>actions<span class="token punctuation">.</span>hooks
    279. 

  279.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'coordinateTransformation'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">：transformateDeltaData</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> 
    280. 

  280.     <span class="token comment">// 获取用户手指移动的距离</span>
    281. 

  281.    <span class="token keyword">const</span> originDeltaX <span class="token operator">=</span> transformateDeltaData<span class="token punctuation">.</span>deltaX
    282. 

  282.    <span class="token keyword">const</span> originDeltaY <span class="token operator">=</span> transformateDeltaData<span class="token punctuation">.</span>deltaY
    283. 

  283. 

  284.    <span class="token comment">// 变换位移</span>
    285. 

  285.    transformateDeltaData<span class="token punctuation">.</span>deltaX <span class="token operator">=</span> originDeltaY
    286. 

  286.    transformateDeltaData<span class="token punctuation">.</span>deltaY <span class="token operator">=</span> originDeltaX
    287. 

  287. 

  288.    <span class="token comment">// transformateDeltaData.deltaX 最终作用在 BetterScroll content DOM 的 translateX</span>
    289. 

  289.    <span class="token comment">// transformateDeltaData.deltaY 最终作用在 BetterScroll content DOM 的 translateY</span>
    290. 

  290.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    291. 

  291. </code></pre></div><p>该钩子通常是为了修正当 BetterScroll 的 wrapper DOM 的祖先元素发生旋转的时候，用户自定义位移变换的逻辑，大部分情况下只需要配置 <a href="/docs/zh-CN/guide/base-scroll-options.html#quadrant">quadrant</a> 即可。</p></li></ul></li> <li><p><strong>Behavior.hooks</strong></p> <ul><li><p><strong>beforeComputeBoundary</strong></p> <ul><li><strong>触发时机</strong>：即将计算滚动边界</li> <li><strong>参数</strong>：boundary 对象
    292. 

  292. <ul><li><code>{ minScrollPos: number, maxScrollPos: number } boundary</code></li></ul></li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    293. 

  293.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    294. 

  294.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>scrollBehaviorX<span class="token punctuation">.</span>hooks
    295. 

  295.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeComputeBoundary'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    296. 

  296. </code></pre></div></li> <li><p><strong>computeBoundary</strong></p> <ul><li><strong>触发时机</strong>：计算滚动边界</li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    297. 

  297.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    298. 

  298.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>scrollBehaviorX<span class="token punctuation">.</span>hooks
    299. 

  299.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'computeBoundary'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">boundary</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    300. 

  300.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>boundary<span class="token punctuation">.</span>minScrollPos<span class="token punctuation">)</span> <span class="token comment">// 上边界最大值，正的越多，下拉的幅度越大</span>
    301. 

  301.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>boundary<span class="token punctuation">.</span>maxScrollPos<span class="token punctuation">)</span> <span class="token comment">// 下边界最小值，负的越多，滚的越远</span>
    302. 

  302.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    303. 

  303. </code></pre></div></li> <li><p><strong>momentum</strong></p> <ul><li><strong>触发时机</strong>：满足触发 momentum 动量动画条件，并且在计算之前</li> <li><strong>参数</strong>：两个参数，第一个是 momentumData 对象，第二个是滚动偏移量
    304. 

  304. <ul><li><code>{ destination: number, duration: number, rate: number} momentumData</code>：destination 是目标位置，duration 是缓动时长，rate 是斜率</li> <li><code>{ number } distance</code>：触发 momentum 的滚动偏移量</li></ul></li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    305. 

  305.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    306. 

  306.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>scrollBehaviorX<span class="token punctuation">.</span>hooks
    307. 

  307.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'momentum'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">momentumData<span class="token punctuation">,</span> distance</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    308. 

  308. </code></pre></div></li> <li><p><strong>end</strong></p> <ul><li><strong>触发时机</strong>：不满足触发 momentum 动量动画条件</li> <li><strong>参数</strong>：momentumInfo 对象
    309. 

  309. <ul><li><code>{ destination: number, duration: number} momentumInfo</code>：destination 是目标位置，duration 是缓动时长</li></ul></li> <li><strong>示例</strong></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    310. 

  310.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    311. 

  311.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>scrollBehaviorX<span class="token punctuation">.</span>hooks
    312. 

  312.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'end'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">momentumInfo</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    313. 

  313.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>momentumInfo<span class="token punctuation">.</span>destination<span class="token punctuation">)</span>
    314. 

  314.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>momentumInfo<span class="token punctuation">.</span>duration<span class="token punctuation">)</span>
    315. 

  315.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    316. 

  316. </code></pre></div></li></ul></li> <li><p><strong>Animation.hooks(useTransition: false)</strong></p> <ul><li><p><strong>forceStop</strong></p> <ul><li><strong>触发时机</strong>：强制让一个滚动的 bs 停止</li> <li><strong>参数</strong>：position 对象
    317. 

  317. <ul><li><code>{ x: number, y: number } position</code>：当前坐标值</li></ul></li></ul></li> <li><p><strong>move</strong></p> <ul><li><strong>触发时机</strong>：滚动进行中</li> <li><strong>参数</strong>：position 对象
    318. 

  318. <ul><li><code>{ x: number, y: number } position</code>：当前坐标值</li></ul></li></ul></li> <li><p><strong>end</strong></p> <ul><li><strong>触发时机</strong>：滚动结束</li> <li><strong>参数</strong>：position 对象
    319. 

  319. <ul><li><code>{ x: number, y: number } position</code>：当前坐标值</li></ul></li></ul></li></ul></li> <li><p><strong>Translater.hooks</strong></p> <ul><li><p><strong>beforeTranslate</strong></p> <ul><li><strong>触发时机</strong>：在修改 content 元素的 transform style 之前，zoom 插件监听了钩子</li> <li><strong>参数</strong>：第一个是 transformStyle 数组，第二个是 point 对象
    320. 

  320. <ul><li><code>{ ['translateX(0px)'|'translateY(0px)'] } transformStyle</code>：当前 transform 对应的属性值</li> <li><code>{ x: number, y: number } point</code>：x 对应 translateX 的值，y 对应 translateY 的值</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    321. 

  321.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    322. 

  322.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>translater<span class="token punctuation">.</span>hooks
    323. 

  323.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeTranslate'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">transformStyle<span class="token punctuation">,</span> point</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    324. 

  324.     transformStyle<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span><span class="token string">'scale(1.2)'</span><span class="token punctuation">)</span>
    325. 

  325.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>transformStyle<span class="token punctuation">)</span> <span class="token comment">// ['translateX(0px)', 'translateY(0px)', 'scale(1.2)']</span>
    326. 

  326.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>point<span class="token punctuation">)</span> <span class="token comment">// { x: 0, y: 0 }</span>
    327. 

  327.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    328. 

  328. </code></pre></div></li></ul></li> <li><p><strong>translate</strong></p> <ul><li><strong>触发时机</strong>：修改 content 元素的 transform style 之后，wheel 插件监听了钩子</li> <li><strong>参数</strong>：point 对象
    329. 

  329. <ul><li><code>{ x: number, y: number } point</code>：x 对应 translateX 的值，y 对应 translateY 的值</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    330. 

  330.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    331. 

  331.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>translater<span class="token punctuation">.</span>hooks
    332. 

  332.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'translate'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">point</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    333. 

  333.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>point<span class="token punctuation">)</span> <span class="token comment">// { x: 0, y: 0 }</span>
    334. 

  334.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    335. 

  335. </code></pre></div></li></ul></li></ul></li> <li><p><strong>Transition.hooks(useTransition: true)</strong></p> <ul><li><p><strong>forceStop</strong></p> <ul><li><strong>触发时机</strong>：强制让一个正在做动画的 bs 停止</li> <li><strong>参数</strong>：position 对象
    336. 

  336. <ul><li><code>{ x: number, y: number } position</code>：当前坐标值</li></ul></li></ul></li> <li><p><strong>move</strong></p> <ul><li><strong>触发时机</strong>：滚动进行中</li> <li><strong>参数</strong>：position 对象
    337. 

  337. <ul><li><code>{ x: number, y: number } position</code>：当前坐标值</li></ul></li></ul></li> <li><p><strong>end</strong></p> <ul><li><strong>触发时机</strong>：滚动结束</li> <li><strong>参数</strong>：position 对象
    338. 

  338. <ul><li><code>{ x: number, y: number } position</code>：当前坐标值</li></ul></li></ul></li> <li><p><strong>time</strong></p> <ul><li><strong>触发时机</strong>：CSS3 transition 开始之前，wheel 插件监听了该钩子</li> <li><strong>参数</strong>：CSS3 transition duration<div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    339. 

  339.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    340. 

  340.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>animater<span class="token punctuation">.</span>hooks
    341. 

  341.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'time'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">duration</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    342. 

  342.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>duration<span class="token punctuation">)</span> <span class="token comment">// 800</span>
    343. 

  343.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    344. 

  344. </code></pre></div></li></ul></li> <li><p><strong>timeFunction</strong></p> <ul><li><strong>触发时机</strong>：CSS3 transition 开始之前，wheel 插件监听了该钩子</li> <li><strong>参数</strong>：CSS3 transition-timing-function<div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    345. 

  345.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    346. 

  346.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>animater<span class="token punctuation">.</span>hooks
    347. 

  347.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'timeFunction'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">easing</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    348. 

  348.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>easing<span class="token punctuation">)</span> <span class="token comment">// cubic-bezier(0.1, 0.7, 1.0, 0.1)</span>
    349. 

  349.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    350. 

  350. </code></pre></div></li></ul></li></ul></li> <li><p><strong>Scroller.hooks</strong></p> <ul><li><p><strong>beforeStart</strong>
    351. 

  351. 同 <code>ScrollerActions.hooks.start</code></p></li> <li><p><strong>beforeMove</strong>
    352. 

  352. 同 <code>ScrollerActions.hooks.beforeMove</code></p></li> <li><p><strong>beforeScrollStart</strong>
    353. 

  353. 同 <code>ScrollerActions.hooks.start</code></p></li> <li><p><strong>scrollStart</strong>
    354. 

  354. 同 <code>ScrollerActions.hooks.scrollStart</code></p></li> <li><p><strong>scroll</strong></p> <ul><li><strong>触发时机</strong>：滚动进行中</li> <li><strong>参数</strong>：position 对象
    355. 

  355. <ul><li><code>{ x: number, y: number } position</code>：当前坐标值</li></ul></li></ul></li> <li><p><strong>beforeEnd</strong>
    356. 

  356. 同 <code>ScrollerActions.hooks.beforeEnd</code></p></li> <li><p><strong>touchEnd</strong></p> <ul><li><strong>触发时机</strong>：用户手指离开滚动区域</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    357. 

  357.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    358. 

  358.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>hooks
    359. 

  359.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'touchEnd'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    360. 

  360.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'your finger has leave'</span><span class="token punctuation">)</span>
    361. 

  361.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    362. 

  362. </code></pre></div></li> <li><p><strong>end</strong></p> <ul><li><strong>触发时机</strong>：touchEnd 之后，校验 click 之前触发，pull-down 插件基于这个钩子实现</li> <li><strong>参数</strong>：position 对象</li> <li><code>{ x: number, y: number } position</code>：当前位置</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    363. 

  363.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    364. 

  364.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>hooks
    365. 

  365.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'end'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">position</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    366. 

  366.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>position<span class="token punctuation">.</span>x<span class="token punctuation">)</span>
    367. 

  367.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>position<span class="token punctuation">.</span>y<span class="token punctuation">)</span>
    368. 

  368.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    369. 

  369. </code></pre></div></li> <li><p><strong>scrollEnd</strong></p> <ul><li><strong>触发时机</strong>：滚动结束</li> <li><strong>参数</strong>：position 对象
    370. 

  370. <ul><li><code>{ x: number, y: number } position</code>：当前坐标值</li></ul></li></ul></li> <li><p><strong>resize</strong></p> <ul><li><strong>触发时机</strong>：window 尺寸发生改变</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    371. 

  371.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    372. 

  372.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>hooks
    373. 

  373.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'resize'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    374. 

  374.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&quot;window's size has changed&quot;</span><span class="token punctuation">)</span>
    375. 

  375.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    376. 

  376. </code></pre></div></li> <li><p><strong>flick</strong></p> <ul><li><strong>触发时机</strong>：探测到手指轻拂动作</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    377. 

  377.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    378. 

  378.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>hooks
    379. 

  379.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'flick'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    380. 

  380. </code></pre></div></li> <li><p><strong>scrollCancel</strong></p> <ul><li><strong>触发时机</strong>：滚动取消或者未发生</li></ul></li> <li><p><strong>momentum</strong></p> <ul><li><strong>触发时机</strong>：即将进行 momentum 动量位移，slide 插件监听了该钩子</li> <li><strong>参数</strong>：scrollMetaData 对象
    381. 

  381. <ul><li><code>{ time: number, easing: EaseItem, newX: number, newY: number }</code>：time 是动画时长，easing是缓动函数，newX 和 newY 是终点</li></ul></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    382. 

  382.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    383. 

  383.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>hooks
    384. 

  384.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'momentum'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">scrollMetaData</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    385. 

  385.     scrollMetaData<span class="token punctuation">.</span>newX <span class="token operator">=</span> <span class="token number">0</span>
    386. 

  386.     scrollMetaData<span class="token punctuation">.</span>newY <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">200</span>
    387. 

  387.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    388. 

  388. </code></pre></div></li> <li><p><strong>scrollTo</strong></p> <ul><li><strong>触发时机</strong>：调用 bs.scrollTo 方法的时候触发</li> <li><strong>参数</strong>：endPoint 对象
    389. 

  389. <ul><li><code>{ x: number, y: number } endPoint</code>：终点坐标值</li></ul></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    390. 

  390.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    391. 

  391.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>hooks
    392. 

  392.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scrollTo'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">endPoint</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    393. 

  393.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>endPoint<span class="token punctuation">.</span>x<span class="token punctuation">)</span>
    394. 

  394.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>endPoint<span class="token punctuation">.</span>y<span class="token punctuation">)</span>
    395. 

  395.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    396. 

  396.   bs<span class="token punctuation">.</span><span class="token function">scrollTo</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">200</span><span class="token punctuation">)</span>
    397. 

  397. </code></pre></div></li> <li><p><strong>scrollToElement</strong></p> <ul><li><strong>触发时机</strong>：调用 bs.scrollToElement 方法的时候触发，wheel 插件监听了该钩子</li> <li><strong>参数</strong>：第一个是目标 DOM 对象，第二个是终点的坐标
    398. 

  398. <ul><li><code>{ HTMLElment } el</code></li> <li><code>{ top: number, left: number } postion</code></li></ul></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    399. 

  399.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    400. 

  400.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>hooks
    401. 

  401.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'scrollToElement'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">el<span class="token punctuation">,</span> pos</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    402. 

  402.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>el<span class="token punctuation">)</span>
    403. 

  403.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>pos<span class="token punctuation">.</span>left<span class="token punctuation">)</span>
    404. 

  404.     console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>pos<span class="token punctuation">.</span>top<span class="token punctuation">)</span>
    405. 

  405.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    406. 

  406.   bs<span class="token punctuation">.</span><span class="token function">scrollToElement</span><span class="token punctuation">(</span><span class="token string">'.some-item'</span><span class="token punctuation">,</span> <span class="token number">300</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
    407. 

  407. </code></pre></div></li> <li><p><strong>beforeRefresh</strong></p> <ul><li><strong>触发时机</strong>：在 behavior 计算边界之前，slide 插件监听了该钩子</li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    408. 

  408.   <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    409. 

  409.   <span class="token keyword">const</span> hooks <span class="token operator">=</span> bs<span class="token punctuation">.</span>scroller<span class="token punctuation">.</span>hooks
    410. 

  410.   hooks<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'beforeRefresh'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    411. 

  411. </code></pre></div></li></ul></li></ul> <div class="custom-block tip"><p class="custom-block-title">提示</p> <p>细心的你会发现，有部分 Scroller.hooks 与 ScrollActions.hooks 的功能一模一样，其实我们内部采用了一种 <a href="https://github.com/ustbhuangyi/better-scroll/blob/dev/packages/core/src/utils/bubbling.ts" target="_blank" rel="noopener noreferrer">钩子冒泡<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 的策略，将内层功能类的钩子，通过冒泡的形式一直代理到 BetterScroll Instance 来兼容 1.x 的使用方式。</p></div></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/ustbhuangyi/better-scroll/edit/dev/packages/vuepress-docs/docs/zh-CN/guide/base-scroll-api.md" target="_blank" rel="noopener noreferrer">在 GitHub 上编辑此页</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2022/7/19 11:44:48</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
    412. 

  412.       ←
    413. 

  413.       <a href="/docs/zh-CN/guide/base-scroll-options.html" class="prev">
    414. 

  414.         配置项
    415. 

  415.       </a></span> <!----></p></div> </main></div><div class="global-ui"><!----></div></div>
    416. 

  416.     <script src="/docs/assets/js/app.c71b64d3.js" defer></script><script src="/docs/assets/js/5.d6412664.js" defer></script><script src="/docs/assets/js/4.4855b9ef.js" defer></script><script src="/docs/assets/js/3.481632b4.js" defer></script><script src="/docs/assets/js/102.79d86e3d.js" defer></script><script src="/docs/assets/js/7.518ccda7.js" defer></script>
    417. 

  417.   </body>
    418. 

  418. </html>
    419.