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// or

<span class="token function">yarn</span> <span class="token function">add</span> @better-scroll/observe-dom
</code></pre></div><h2 id="使用"><a href="#使用" class="header-anchor">#</a> 使用</h2> <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">import</span> ObserveDOM <span class="token keyword">from</span> <span class="token string">'@better-scroll/observe-dom'</span>
  BScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>ObserveDOM<span class="token punctuation">)</span>

  <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.bs-wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token comment">//...</span>
    <span class="token literal-property property">observeDOM</span><span class="token operator">:</span> <span class="token boolean">true</span> <span class="token comment">// 开启 observe-dom 插件</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><h2 id="示例"><a href="#示例" class="header-anchor">#</a> 示例</h2> <div class="demo-wrap"><div class="demo-nav"><i class="demo-nav-btn icon-code"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="#000"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="3" d="M10 20l4-16m4 4l4 4-4 4M6 16l-4-4 4-4"></path></svg></i> <div class="v-popover"><div class="trigger" style="display:inline-block;"><i class="demo-nav-btn icon-qrcode"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="#666"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v1m6 11h2m-6 0h-2v4m0-11v3m0 0h.01M12 12h4.01M16 20h4M4 12h4m12 0h.01M5 8h2a1 1 0 001-1V5a1 1 0 00-1-1H5a1 1 0 00-1 1v2a1 1 0 001 1zm12 0h2a1 1 0 001-1V5a1 1 0 00-1-1h-2a1 1 0 00-1 1v2a1 1 0 001 1zM5 20h2a1 1 0 001-1v-2a1 1 0 00-1-1H5a1 1 0 00-1 1v2a1 1 0 001 1z"></path></svg></i> </div> <div id="popover_xfor3nt4qs" aria-hidden="true" tabindex="0" class="tooltip popover vue-popover-theme" style="visibility:hidden;"><div class="wrapper"><div class="tooltip-inner popover-inner" style="position:relative;"><div><div></div></div> <div tabindex="-1" class="resize-observer" data-v-8859cc6c></div></div> <div class="tooltip-arrow popover-arrow"></div></div></div></div> <i class="demo-nav-btn icon-preview"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="#666"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9.75 17L9 20l-1 1h8l-1-1-.75-3M3 13h18M5 17h14a2 2 0 002-2V5a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z"></path></svg></i></div> <div class="demo-code" style="display:;"><div class="demo-code-nav"><button class="demo-code-btn active">Template</button><button class="demo-code-btn">Script</button><button class="demo-code-btn">Style</button></div> <div class="demo-code-content"><div class="demo-code-item" style="display:;"><div class="language-vue extra-class"><pre class="language-vue"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>observe-dom-container<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>scroll-wrapper<span class="token punctuation">&quot;</span></span> <span class="token attr-name">ref</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>scroll<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>scroll-content<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>scroll-item<span class="token punctuation">&quot;</span></span> <span class="token attr-name">v-for</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>num in nums<span class="token punctuation">&quot;</span></span> <span class="token attr-name">:key</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>num<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>{{nums - num + 1}}<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
		<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn<span class="token punctuation">&quot;</span></span> <span class="token attr-name">@click</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>handleClick<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>append two children element<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span></code></pre></div></div><div class="demo-code-item" style="display:none;"><div class="language-vue extra-class"><pre class="language-vue"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>text/ecmascript-6<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
  <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">import</span> ObserveDOM <span class="token keyword">from</span> <span class="token string">'@better-scroll/observe-dom'</span>

  BScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>ObserveDOM<span class="token punctuation">)</span>
  <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
    <span class="token function">data</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">nums</span><span class="token operator">:</span> <span class="token number">10</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token function">mounted</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token function">beforeDestroy</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>bs<span class="token punctuation">.</span><span class="token function">destroy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token literal-property property">methods</span><span class="token operator">:</span> <span class="token punctuation">{</span>
      <span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</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 keyword">this</span><span class="token punctuation">.</span>$refs<span class="token punctuation">.</span>scroll<span class="token punctuation">,</span> <span class="token punctuation">{</span>
          <span class="token literal-property property">observeDOM</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
          <span class="token literal-property property">scrollX</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
          <span class="token literal-property property">scrollY</span><span class="token operator">:</span> <span class="token boolean">false</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token function">handleClick</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">// observe-dom plugin will refresh bs</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>nums <span class="token operator">+=</span> <span class="token number">2</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span></code></pre></div></div><div class="demo-code-item" style="display:none;"><div class="language-styl extra-class"><pre class="language-styl"><code>&lt;style lang=<span class="token string">&quot;stylus&quot;</span> rel=<span class="token string">&quot;stylesheet/stylus&quot;</span> scoped&gt;

<span class="token selector">.observe-dom-container</span>
  <span class="token property-declaration"><span class="token property">text-align</span> center</span>
  <span class="token selector">.scroll-wrapper</span>
    <span class="token property-declaration"><span class="token property">width</span> <span class="token number">90</span><span class="token unit">%</span></span>
    <span class="token property-declaration"><span class="token property">margin</span> <span class="token number">80</span><span class="token unit">px</span> auto</span>
    <span class="token property-declaration"><span class="token property">white-space</span> nowrap</span>
    <span class="token property-declaration"><span class="token property">border</span> <span class="token number">3</span><span class="token unit">px</span> solid <span class="token hexcode">#42b983</span></span>
    <span class="token property-declaration"><span class="token property">border-radius</span> <span class="token number">5</span><span class="token unit">px</span></span>
    <span class="token property-declaration"><span class="token property">overflow</span> hidden</span>
    <span class="token selector">.scroll-content</span>
      <span class="token property-declaration"><span class="token property">display</span> inline-block</span>
      <span class="token selector">.scroll-item</span>
        <span class="token property-declaration"><span class="token property">height</span> <span class="token number">50</span><span class="token unit">px</span></span>
        <span class="token property-declaration"><span class="token property">line-height</span> <span class="token number">50</span><span class="token unit">px</span></span>
        <span class="token property-declaration"><span class="token property">font-size</span> <span class="token number">24</span><span class="token unit">px</span></span>
        <span class="token property-declaration"><span class="token property">display</span> inline-block</span>
        <span class="token property-declaration"><span class="token property">text-align</span> center</span>
        <span class="token property-declaration"><span class="token property">padding</span> <span class="token number">0</span> <span class="token number">20</span><span class="token unit">px</span></span>
        <span class="token selector">&amp;:nth-child(2n)</span>
          <span class="token property-declaration"><span class="token property">background-color</span> <span class="token hexcode">#C3D899</span></span>
        <span class="token selector">&amp;:nth-child(2n+1)</span>
          <span class="token property-declaration"><span class="token property">background-color</span> <span class="token hexcode">#F2D4A7</span></span>
	<span class="token selector">.btn</span>
		<span class="token property-declaration"><span class="token property">margin</span> <span class="token number">40</span><span class="token unit">px</span> auto</span>
		<span class="token property-declaration"><span class="token property">padding</span> <span class="token number">10</span><span class="token unit">px</span></span>
		<span class="token property-declaration"><span class="token property">color</span> <span class="token hexcode">#fff</span></span>
		<span class="token property-declaration"><span class="token property">border-radius</span> <span class="token number">4</span><span class="token unit">px</span></span>
		<span class="token property-declaration"><span class="token property">font-size</span> <span class="token number">20</span><span class="token unit">px</span></span>
		<span class="token property-declaration"><span class="token property">background-color</span> <span class="token hexcode">#666</span>   			</span>
&lt;/style&gt;</code></pre></div></div> <i class="demo-code-content-copy"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="#ccc"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3"></path></svg></i> <!----></div></div> <div class="demo-main"><div class="demo-component-wrap"></div></div></div> <div class="custom-block warning"><p class="custom-block-title">注意</p> <p>由于插件的内部实现使用的是 <a href="https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver" target="_blank" rel="noopener noreferrer">MutationObserver<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>，它无法探测到 img 标签的是否加载完成，因此对于 content 内部含有不确定高度的图片，需要等图片加载完成再调用 bs.refresh() 来重新计算可滚动尺寸。如果浏览器不支持 MutationObserver，插件内部的降级方案是每秒重新计算可滚动的尺寸。</p></div> <div class="custom-block tip"><p class="custom-block-title">提示</p> <p>v2.1.0 版本，新增 <a href="./observe-image">observe-image</a> 插件来探测 img 标签的加载，因此这两者可以搭配起来，补齐<strong>主动刷新</strong>的能力来更新 BetterScroll 每次滚动的宽度或者高度。</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/plugins/observe-dom.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">2021/1/1 21:41:38</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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