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href="/blog/pages/07b384c2e6232e07/" class="sidebar-link">父组件给子组件传值</a></li><li><a href="/blog/pages/0f19a1bcac14fd41/" class="sidebar-link">子组件派发事件和值给父组件</a></li><li><a href="/blog/pages/a3080f60f6596eb4/" class="sidebar-link">Prop 验证 与 非 Prop 的 Attribute</a></li><li><a href="/blog/pages/9651417d08d1779d/" class="sidebar-link">自定义事件</a></li><li><a href="/blog/pages/809f4582d9ca9552/" class="sidebar-link">兄弟组件传值</a></li><li><a href="/blog/pages/d408e64f666f146d/" class="sidebar-link">非父子组件传值</a></li><li><a href="/blog/pages/2e24dab728769e0c/" class="sidebar-link">父组件调用子组件方法并传入值</a></li><li><a href="/blog/pages/055ecee9a4325386/" class="sidebar-link">插槽slot</a></li><li><a href="/blog/pages/636ca33122e9a64b/" aria-current="page" class="active sidebar-link">动态组件与 v-once 指令</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/636ca33122e9a64b/#动态组件" class="sidebar-link">动态组件</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/636ca33122e9a64b/#动态组件-demo" class="sidebar-link">动态组件 demo</a></li></ul></li><li class="sidebar-sub-header level2"><a href="/blog/pages/636ca33122e9a64b/#v-once-指令" class="sidebar-link">v-once 指令</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level3"><a href="/blog/pages/636ca33122e9a64b/#通过-v-once-创建低开销的静态组件" class="sidebar-link">通过 v-once 创建低开销的静态组件</a></li></ul></li></ul></li><li><a href="/blog/pages/e6cec47efa42d7f1/" class="sidebar-link">vue父子组件的生命周期顺序</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>过渡&amp;动画</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>可复用性&amp;组合</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>规模化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Vuex</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>其他</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06225672><div class="articleInfo" data-v-06225672><ul class="breadcrumbs" data-v-06225672><li data-v-06225672><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06225672></a></li> <li data-v-06225672><a href="/blog/note/vue/#《Vue》笔记" data-v-06225672>《Vue》笔记</a></li><li data-v-06225672><a href="/blog/note/vue/#组件" data-v-06225672>组件</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="https://github.com/heBody" target="_blank" title="作者" class="beLink" data-v-06225672>heBody</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2020-02-16</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">动态组件与 v-once 指令<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="动态组件与-v-once-指令"><a href="#动态组件与-v-once-指令" class="header-anchor">#</a> 动态组件与 v-once 指令</h1> <h2 id="动态组件"><a href="#动态组件" class="header-anchor">#</a> 动态组件</h2> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>root<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>component</span> <span class="token attr-name">:is</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>type<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>component</span><span class="token punctuation">&gt;</span></span> <span class="token comment">&lt;!--其效果如同下面两行被注释的代码--&gt;</span>
	<span class="token comment">&lt;!-- &lt;child-one v-if=&quot;type === 'child-one'&quot;&gt;&lt;/child-one&gt;
	    &lt;child-two v-if=&quot;type === 'child-two'&quot;&gt;&lt;/child-two&gt; --&gt;</span>
	<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</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>change<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>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/javascript<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
    Vue<span class="token punctuation">.</span><span class="token function">component</span><span class="token punctuation">(</span><span class="token string">'child-one'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">template</span><span class="token operator">:</span> <span class="token string">'&lt;div&gt;child-one&lt;/div&gt;'</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
    Vue<span class="token punctuation">.</span><span class="token function">component</span><span class="token punctuation">(</span><span class="token string">'child-two'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">template</span><span class="token operator">:</span> <span class="token string">'&lt;div&gt;child-two&lt;/div&gt;'</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token keyword">var</span> vm <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Vue</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        <span class="token literal-property property">el</span><span class="token operator">:</span> <span class="token string">'#root'</span><span class="token punctuation">,</span>
        <span class="token literal-property property">data</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            <span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'child-one'</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">handleClick</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>type <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>type <span class="token operator">===</span> <span class="token string">'child-one'</span> <span class="token operator">?</span> <span class="token string">'child-two'</span> <span class="token operator">:</span> <span class="token string">'child-one'</span>
            <span class="token punctuation">}</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 class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br></div></div><p>上面代码中，点击按钮在两个组件间切换，可使用<code>&lt;component&gt;</code>标签并绑定<code>:is</code>为动态组件名。</p> <h3 id="动态组件-demo"><a href="#动态组件-demo" class="header-anchor">#</a> 动态组件 demo</h3> <p data-height="300" data-theme-id="light" data-default-tab="js,result" data-user="heBody" data-slug-hash="YzXqNMO" data-pen-title="动态组件" class="codepen" style="height:300px;box-sizing:border-box;display:flex;align-items:center;justify-content:center;border:2px solid;margin:1em 0;padding:1em;"><span>See the Pen <a href="https://codepen.io/heBody/pen/YzXqNMO">
  动态组件</a> by heBody (<a href="https://codepen.io/heBody">@heBody</a>)
  on <a href="https://codepen.io">CodePen</a>.</span></p> <script async="async" src="https://static.codepen.io/assets/embed/ei.js"></script> <h2 id="v-once-指令"><a href="#v-once-指令" class="header-anchor">#</a> v-once 指令</h2> <ul><li><p><strong>不需要表达式</strong></p></li> <li><p><strong>详细</strong>：</p> <p>只渲染元素和组件<strong>一次</strong>。随后的重新渲染，元素/组件及其所有的子节点将被视为静态内容并跳过。这可以用于优化更新性能。</p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token comment">&lt;!-- 单个元素 --&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span> <span class="token attr-name">v-once</span><span class="token punctuation">&gt;</span></span>This will never change: {{msg}}<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span>
<span class="token comment">&lt;!-- 有子元素 --&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">v-once</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span><span class="token punctuation">&gt;</span></span>comment<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span>{{msg}}<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</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 comment">&lt;!-- 组件 --&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>my-component</span> <span class="token attr-name">v-once</span> <span class="token attr-name">:comment</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>msg<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>my-component</span><span class="token punctuation">&gt;</span></span>
<span class="token comment">&lt;!-- `v-for` 指令--&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>ul</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</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>i in list<span class="token punctuation">&quot;</span></span> <span class="token attr-name">v-once</span><span class="token punctuation">&gt;</span></span>{{i}}<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>ul</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div></li> <li><p><strong>参考</strong>：</p> <ul><li><a href="https://cn.vuejs.org/v2/guide/syntax.html#%E6%8F%92%E5%80%BC" target="_blank" rel="noopener noreferrer">数据绑定语法- 插值<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></li> <li><a href="https://cn.vuejs.org/v2/guide/components-edge-cases.html#%E9%80%9A%E8%BF%87-v-once-%E5%88%9B%E5%BB%BA%E4%BD%8E%E5%BC%80%E9%94%80%E7%9A%84%E9%9D%99%E6%80%81%E7%BB%84%E4%BB%B6" target="_blank" rel="noopener noreferrer">组件 - 对低开销的静态组件使用 <code>v-once</code><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></li></ul></li></ul> <h3 id="通过-v-once-创建低开销的静态组件"><a href="#通过-v-once-创建低开销的静态组件" class="header-anchor">#</a> 通过 <code>v-once</code> 创建低开销的静态组件</h3> <p>渲染普通的 HTML 元素在 Vue 中是非常快速的，但有的时候你可能有一个组件，这个组件包含了<strong>大量</strong>静态内容。在这种情况下，你可以在根元素上添加 <code>v-once</code> attribute 以确保这些内容只计算一次然后缓存起来，就像这样：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code>Vue<span class="token punctuation">.</span><span class="token function">component</span><span class="token punctuation">(</span><span class="token string">'terms-of-service'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  <span class="token literal-property property">template</span><span class="token operator">:</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">
    &lt;div v-once&gt;
      &lt;h1&gt;Terms of Service&lt;/h1&gt;
      ... a lot of static content ...
    &lt;/div&gt;
  </span><span class="token template-punctuation string">`</span></span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><div class="custom-block danger"><p class="custom-block-title">警告</p> <p>再说一次，试着不要过度使用这个模式。当你需要渲染大量静态内容时，极少数的情况下它会给你带来便利，除非你非常留意渲染变慢了，不然它完全是没有必要的——再加上它在后期会带来很多困惑。例如，设想另一个开发者并不熟悉 <code>v-once</code> 或漏看了它在模板中，他们可能会花很多个小时去找出模板为什么无法正确更新。</p></div></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/《Vue》笔记/02.组件/80.动态组件与 v-once 指令.md" target="_blank" rel="noopener noreferrer">编辑</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="tags"><a href="/blog/tags/?tag=Vue" title="标签">#Vue</a></div> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2022/12/14, 19:36:42</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/blog/pages/055ecee9a4325386/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">插槽slot</div></a> <a href="/blog/pages/e6cec47efa42d7f1/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">vue父子组件的生命周期顺序</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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