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- <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>content<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
- <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>...<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
- <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>...<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
- ...
- <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span>
- <span class="token comment"><!-- 这里可以放一些其它的 DOM，但不会影响滚动 --></span>
- <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
- </code></pre></div><p>上面的代码中 BetterScroll 是作用在外层 <strong>wrapper</strong> 容器上的，滚动的部分是 <strong>content</strong> 元素。这里要注意的是，BetterScroll 默认处理容器（wrapper）的第一个子元素（content）的滚动，其它的元素都会被忽略。</p> <p>最简单的初始化代码如下：</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>
- <span class="token keyword">let</span> wrapper <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">)</span>
- <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>wrapper<span class="token punctuation">)</span>
- </code></pre></div><p>BetterScroll 提供了一个类，实例化的第一个参数是一个原生的 DOM 对象。当然，如果传递的是一个字符串，BetterScroll 内部会尝试调用 querySelector 去获取这个 DOM 对象。</p> <div class="custom-block warning"><p class="custom-block-title">注意</p> <p>BetterScroll 2.X 里面，我们将 1.X 耦合的 feature 拆分至插件，以达到按需加载、减少包体积的目的。因此，<code>@better-scroll/core</code> 只提供了最核心的滚动能力。如果想要实现<strong>上拉加载</strong>、<strong>下拉刷新</strong>的功能，你需要使用对应的<a href="/zh-CN/plugins">插件</a>。</p></div> <div class="custom-block tip"><p class="custom-block-title">提示</p> <p>版本 2.0.4 的 BetterScroll 可以通过 <a href="/docs/zh-CN/guide/base-scroll-options.html#specifiedindexascontent-2-0-4">specifiedIndexAsContent</a> 来指定 wrapper 的某个子元素作为 content。</p></div> <h2 id="滚动原理"><a href="#滚动原理" class="header-anchor">#</a> 滚动原理</h2> <p>很多人已经用过 BetterScroll，我收到反馈最多的问题是：</p> <blockquote><p>BetterScroll 初始化了， 但是没法滚动。</p></blockquote> <p>不能滚动是现象，我们得搞清楚这其中的根本原因。在这之前，我们先来看一下浏览器的滚动原理：
- 浏览器的滚动条大家都会遇到，当页面内容的高度超过视口高度的时候，会出现纵向滚动条；当页面内容的宽度超过视口宽度的时候，会出现横向滚动条。也就是当我们的视口展示不下内容的时候，会通过滚动条的方式让用户滚动屏幕看到剩余的内容。</p> <p>BetterScroll 也是一样的原理，我们可以用一张图更直观的感受一下：</p> <img data-zoomable="" src="/docs/assets/images/schematic.png" alt="原理图"> <p>绿色部分为 wrapper，也就是父容器，它会有<strong>固定的高度</strong>。黄色部分为 content，它是父容器的<strong>第一个子元素</strong>，它的高度会随着内容的大小而撑高。那么，当 content 的高度不超过父容器的高度，是不能滚动的，而它一旦超过了父容器的高度，我们就可以滚动内容区了，这就是 BetterScroll 的滚动原理。</p> <h2 id="betterscroll-在-mvvm-框架的应用"><a href="#betterscroll-在-mvvm-框架的应用" class="header-anchor">#</a> BetterScroll 在 MVVM 框架的应用</h2> <p>我之前写过一篇<a href="https://zhuanlan.zhihu.com/p/27407024" target="_blank" rel="noopener noreferrer">当 BetterScroll 遇见 Vue<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>，也希望大家投稿，分享一下 BetterScroll 在其它框架下的使用心得。</p> <p>一款超赞的基于 Vue 实现的组件库 <a href="https://github.com/didi/cube-ui/" target="_blank" rel="noopener noreferrer">cube-ui<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>。</p> <h2 id="betterscroll-在实战项目中的运用"><a href="#betterscroll-在实战项目中的运用" class="header-anchor">#</a> BetterScroll 在实战项目中的运用</h2> <p>如果你想学习 BetterScroll 在实战项目中的运用，也可以去学习我的 2 门实战课程。</p> <p><a href="https://coding.imooc.com/class/74.html" target="_blank" rel="noopener noreferrer">Vue.js 高仿外卖饿了么实战课程<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></p> <p><a href="http://ustbhuangyi.com/sell/" target="_blank" rel="noopener noreferrer">项目演示地址<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></p> <p><img src="https://qr.api.cli.im/qr?data=http%253A%252F%252Fustbhuangyi.com%252Fsell%252F%2523%252Fgoods&level=H&transparent=false&bgcolor=%23ffffff&forecolor=%23000000&blockpixel=12&marginblock=1&logourl=&size=280&kid=cliim&key=686203a49c4613080b5b3004323ff977" alt="二维码"></p> <p><a href="http://coding.imooc.com/class/107.html" target="_blank" rel="noopener noreferrer">Vue.js 音乐 App 高级实战课程<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></p> <p><a href="http://ustbhuangyi.com/music/" target="_blank" rel="noopener noreferrer">项目演示地址<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></p> <p><img src="https://qr.api.cli.im/qr?data=http%253A%252F%252Fustbhuangyi.com%252Fmusic%252F&level=H&transparent=false&bgcolor=%23ffffff&forecolor=%23000000&blockpixel=12&marginblock=1&logourl=&size=280&kid=cliim&key=731bbcc2b490454d2cc604f98539952c" alt="二维码"></p></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/README.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 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