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data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/article/%E5%BD%BB%E5%BA%95%E6%90%9E%E6%87%82%E5%AF%B9%E8%B1%A1%E7%9A%84%E6%95%B0%E6%8D%AE%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6%E3%80%81%E5%AD%98%E5%82%A8%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>彻底搞懂对象的数据属性描述符、存储属性描述符</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/article/%E6%B5%85%E6%9E%90defineProperty%E4%B8%8EProxy%E5%AE%9E%E7%8E%B0%E7%9A%84%E5%8F%8C%E5%90%91%E7%BB%91%E5%AE%9A.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>浅析defineProperty与Proxy实现的双向绑定</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>深入JavaScript数据类型</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5Vue3%E6%BA%90%E7%A0%81%EF%BC%8C%E7%9C%8B%E7%9C%8BVue.use%E5%90%8E%E7%A9%B6%E7%AB%9F%E5%8F%91%E7%94%9F%E4%BA%86%E4%BB%80%E4%B9%88%EF%BC%9F.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>深入Vue3源码，看看Vue.use后究竟发生了什么？</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3Proxy%E4%B8%8EReflect.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>深入理解Proxy与Reflect</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3%E6%B5%8F%E8%A7%88%E5%99%A8%E7%BC%93%E5%AD%98%E6%9C%BA%E5%88%B6.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>深入理解浏览器缓存机制</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BF%90%E8%A1%8C%E5%8E%9F%E7%90%86.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>深入理解浏览器运行原理</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><!--]--></div></section></div><div class="group" data-v-eec6a639><section class="VPSidebarItem level-0 collapsible" data-v-eec6a639 data-v-66b47b62><div class="item" role="button" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link" data-v-66b47b62 data-v-8dd200cc><!--[--><h2 class="text" data-v-66b47b62>学习笔记</h2><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-66b47b62><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-66b47b62><!--[--><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/note/JavaScript.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>JavaScript基础</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/note/CSS.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>CSS基础</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/note/JavaScriptEnhanced.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>JavaScript进阶</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/note/Front-end%20Engineering.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>前端工程化</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-66b47b62 data-v-66b47b62><div class="item" data-v-66b47b62><div class="indicator" data-v-66b47b62></div><a class="VPLink link link" href="/note/SSR.html" data-v-66b47b62 data-v-8dd200cc><!--[--><p class="text" data-v-66b47b62>服务端渲染</p><!--]--><!----></a><div class="caret" role="button" data-v-66b47b62><!----></div></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-3af881ed data-v-e31feb0e><div class="VPDoc has-sidebar has-aside" data-v-e31feb0e data-v-30dabfe4><div class="container" data-v-30dabfe4><div class="aside" data-v-30dabfe4><div class="aside-curtain" data-v-30dabfe4></div><div class="aside-container" data-v-30dabfe4><div class="aside-content" data-v-30dabfe4><div class="VPDocAside" data-v-30dabfe4 data-v-7110f5c9><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" data-v-7110f5c9 data-v-9c6f1a55><div class="content" data-v-9c6f1a55><div class="outline-marker" data-v-9c6f1a55></div><div class="outline-title" data-v-9c6f1a55>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-9c6f1a55><span class="visually-hidden" id="doc-outline-aria-label" data-v-9c6f1a55> Table of Contents for current page </span><ul class="root" data-v-9c6f1a55 data-v-02afc12d><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-7110f5c9></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30dabfe4><div class="content-container" data-v-30dabfe4><!--[--><!--]--><main class="main" data-v-30dabfe4><div style="position:relative;" class="vp-doc _article_%E4%B8%80%E6%96%87%E8%AF%BB%E6%87%82%E4%BA%8B%E4%BB%B6%E5%86%92%E6%B3%A1%E4%B8%8E%E4%BA%8B%E4%BB%B6%E6%8D%95%E8%8E%B7" data-v-30dabfe4><div><h1 id="一文读懂事件冒泡与事件捕获" tabindex="-1">一文读懂事件冒泡与事件捕获 <a class="header-anchor" href="#一文读懂事件冒泡与事件捕获" aria-hidden="true">#</a></h1><h2 id="💡-从例子入手" tabindex="-1">💡 从例子入手 <a class="header-anchor" href="#💡-从例子入手" aria-hidden="true">#</a></h2><p>这是一个<a href="https://mdn.github.io/learning-area/javascript/building-blocks/events/show-video-box.html" target="_blank" rel="noreferrer">简单的 Demo</a>，点击的 <code>Display video</code> 按钮后，将视频展示出来。</p><p>其中的视频 <code><video></code> 标签被 <code><div></code> 包裹，<code><div></code> 与 <code><video></code> 上都绑定了自己的 <code>click</code> 事件。</p><p><a href="https://code.juejin.cn/pen/7092947625791455262" target="_blank" rel="noreferrer">代码片段</a></p><p>我们的预期是：点击 <code><video></code> 时播放视频，点击 <code><div></code> 时隐藏视频，然而实际上你会发现，点击视频后，不仅视频虽然正常播放，但同时也被隐藏了。</p><p>点击子元素，父元素的事件也被触发，导致这种现象的原因正是：<strong>浏览器的事件冒泡机制</strong>。</p><h2 id="🤔-什么是事件冒泡机制-事件捕获又是什么" tabindex="-1">🤔 什么是事件冒泡机制？事件捕获又是什么？ <a class="header-anchor" href="#🤔-什么是事件冒泡机制-事件捕获又是什么" aria-hidden="true">#</a></h2><p>现代浏览器提供了两种事件处理阶段：<strong>捕获阶段与冒泡阶段</strong>，</p><p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/712c504b08f946088fc51dd5f8959020~tplv-k3u1fbpfcp-zoom-1.image" alt="bubbling-capturing.png"></p><blockquote><p>在捕获阶段：</p><ul><li>浏览器检查元素的最外层祖先 <code><html></code> ，是否在捕获阶段中注册了一个 <code>onclick</code> 事件处理程序，如果是，则运行它。</li><li>然后，它移动到 <code><html></code> 中单击元素的下一个祖先元素，执行相同的操作，然后是单击元素再下一个祖先元素，依此类推，直到到达实际点击的元素。</li></ul></blockquote><blockquote><p>在冒泡阶段，与上述顺序相反：</p><ul><li>浏览器检查实际点击的元素是否在冒泡阶段中注册了一个 <code>onclick</code> 事件处理程序，如果是，则运行它</li><li>然后它移动到下一个直接的祖先元素，并做同样的事情，然后是下一个，等等，直到它到达 <code><html></code> 元素。</li></ul></blockquote><p>当一个事件被触发时，浏览器<strong>先运行捕获阶段，后运行冒泡阶段</strong>，并且在默认情况下，<strong>所有事件处理程序都在冒泡阶段进行注册</strong>。</p><p>针对上面提到的问题，我们可以知道：当 <code><video></code> 点击事件触发后，虽然我们没有主动触发 <code><div></code> 上绑定的点击事件，但由于冒泡机制，点击事件冒泡到了 <code><div></code> 上，并触发了绑定在其上的监听回调函数，将 <code><video></code> 标签隐藏。</p><h3 id="📌-用例子验证结论" tabindex="-1">📌 用例子验证结论 <a class="header-anchor" href="#📌-用例子验证结论" aria-hidden="true">#</a></h3><p>下面是一个用于验证上述结论的Demo：</p><p>页面中包括由外向内的三个类名不同的div标签： <code>div1</code> <code>div2</code> <code>div3</code>，并为他们在捕获阶段/冒泡阶段分别绑定了不同的事件函数 <code>click</code> 和 <code>dblclick</code>。</p><p><a href="https://code.juejin.cn/pen/7092975347720781861" target="_blank" rel="noreferrer">代码片段</a></p><p>当点击最内部的 <code>div3</code> 后，浏览器控制台输出：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">> 捕获 click div1</span></span>
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<span class="line"><span style="color:#A6ACCD;">> 捕获 click div2</span></span>
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<span class="line"><span style="color:#A6ACCD;">> 捕获 click div3</span></span>
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<span class="line"><span style="color:#A6ACCD;">> 冒泡 click div3</span></span>
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<span class="line"><span style="color:#A6ACCD;">> 冒泡 click div2</span></span>
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<span class="line"><span style="color:#A6ACCD;">> 冒泡 click div1</span></span>
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<span class="line"><span style="color:#A6ACCD;"></span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><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></div></div><p>捕获阶段先执行，由外向内，冒泡阶段后执行，由内向外。 <code>dblclick</code> 事件并未被触发。</p><p>由此可知：</p><ul><li>事件触发 => 捕获阶段 => 冒泡阶段</li><li>默认情况下，所有事件都在冒泡阶段被注册</li><li>捕获阶段，浏览器<strong>由外层向内层</strong>逐个元素检查事件函数，如有则执行它。</li><li>冒泡阶段，浏览器<strong>由内层向外层</strong>逐个元素检查事件函数，如有则执行它。</li><li>子元素一个事件触发后，只有<strong>相同的事件会被捕获/冒泡检查</strong></li></ul><hr><p>在本例中，通过为 <code>addEventListener</code> 函数<strong>指定第三个参数，从而在捕获阶段监听事件</strong></p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">target</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">addEventListener</span><span style="color:#A6ACCD;">(type</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> listener</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> useCapture)</span><span style="color:#89DDFF;">;</span></span>
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<span class="line"></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p>当 <code>useCapture</code> 为 <code>true</code> 时，事件监听回调函数将在捕获阶段被触发。</p><h2 id="🧐-为什么有两个阶段-它们有什么用" tabindex="-1">🧐 为什么有两个阶段？它们有什么用？ <a class="header-anchor" href="#🧐-为什么有两个阶段-它们有什么用" aria-hidden="true">#</a></h2><h3 id="📌-历史渊源" tabindex="-1">📌 历史渊源 <a class="header-anchor" href="#📌-历史渊源" aria-hidden="true">#</a></h3><blockquote><p>在过去，Netscape（网景）只使用事件捕获，而Internet Explorer只使用事件冒泡。当W3C决定尝试规范这些行为并达成共识时，他们最终得到了包括这两种情况（捕捉和冒泡）的系统，最终被应用在现代浏览器中。</p></blockquote><h3 id="📌-事件代理-event-delegation" tabindex="-1">📌 事件代理 (Event delegation) <a class="header-anchor" href="#📌-事件代理-event-delegation" aria-hidden="true">#</a></h3><p>利用捕获/冒泡机制，我们可以实现事件代理，什么是事件代理？</p><p>试想一下，此时有一个包含大量列表项的无序列表，我们希望每一个 <code><li></code> 的点击事件都能被监听并且添加特定的处理函数，然而我们不可能为每一个 <code><li></code> 都添加一次事件监听函数，这样效率太低了。</p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#89DDFF;"><</span><span style="color:#F07178;">ul</span><span style="color:#89DDFF;">></span></span>
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<span class="line"></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><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></div></div><p>这时，我们可以为最外层的 <code><ul></code> 绑定一个 <code>click</code> 事件的监听函数，利用捕获/冒泡机制，就可以在事件对象的 <code>target</code> 属性中拿到对应的 <code><li></code>。</p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">document</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">querySelector</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">"</span><span style="color:#C3E88D;">ul</span><span style="color:#89DDFF;">"</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">addEventListener</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">"</span><span style="color:#C3E88D;">click</span><span style="color:#89DDFF;">"</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">e</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=></span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
|
||
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">e</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">target</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span><span style="color:#F07178;"> </span><span style="color:#676E95;font-style:italic;">// > li (实际点击的元素)</span></span>
|
||
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">e</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">currentTarget</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span><span style="color:#F07178;"> </span><span style="color:#676E95;font-style:italic;">// > ul (事件绑定的元素)</span></span>
|
||
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">;</span></span>
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||
<span class="line"></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><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></div></div><h3 id="📌-事件对象中的target与currenttarget" tabindex="-1">📌 事件对象中的<code>target</code>与<code>currentTarget</code> <a class="header-anchor" href="#📌-事件对象中的target与currenttarget" aria-hidden="true">#</a></h3><p>在实际的使用中，你会发现事件对象中存在两个不同的属性：<code>target</code> <code>currentTarget</code>。</p><p>它们有什么区别？和回调函数中的 <code>this</code> 的关系是怎样的？</p><p>复用上面验证捕获与冒泡顺序结论的例子，下面的代码片段验证了 <code>target</code> 和 <code>currentTarget</code> 的关系。</p><p><a href="https://code.juejin.cn/pen/7092980795211513892" target="_blank" rel="noreferrer">代码片段</a></p><p>当点击最内部的 <code>div3</code> 后，浏览器控制台输出：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">> 捕获 target: div3 currentTarget: div1 this: div1</span></span>
|
||
<span class="line"><span style="color:#A6ACCD;">> 捕获 target: div3 currentTarget: div2 this: div2</span></span>
|
||
<span class="line"><span style="color:#A6ACCD;">> 捕获 target: div3 currentTarget: div3 this: div3</span></span>
|
||
<span class="line"><span style="color:#A6ACCD;">> 冒泡 target: div3 currentTarget: div3 this: div3</span></span>
|
||
<span class="line"><span style="color:#A6ACCD;">> 冒泡 target: div3 currentTarget: div2 this: div2</span></span>
|
||
<span class="line"><span style="color:#A6ACCD;">> 冒泡 target: div3 currentTarget: div1 this: div1</span></span>
|
||
<span class="line"><span style="color:#A6ACCD;"></span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><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></div></div><p>由此可知，事件对象中的 <code>target</code> 属性为实际触发事件的DOM元素，<code>currentTarget</code> 指向注册事件监听时绑定的DOM元素。</p><p>需要注意的是，为了验证 <code>this</code> 指向，此处使用了 <code>function</code> 声明函数替代前例中的 <code>() => {}</code>，如果仍以箭头函数形式声明，则 <code>this</code> 始终指向 <code>Window</code> 对象。</p><h2 id="🥳-如何阻止事件冒泡" tabindex="-1">🥳 如何阻止事件冒泡？ <a class="header-anchor" href="#🥳-如何阻止事件冒泡" aria-hidden="true">#</a></h2><p>如你所见，大多数情况事件冒泡机制可以为我们带来便利，但是少数情况（如本文开头的例子）下，会影响预期的代码效果，我们应该如何阻止事件冒泡呢？</p><h3 id="📌-stoppropagation" tabindex="-1">📌 .stopPropagation() <a class="header-anchor" href="#📌-stoppropagation" aria-hidden="true">#</a></h3><p>直接调用 <code>e.stopPropagation()</code> 阻止事件向上冒泡 触发其他回调</p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">document</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">querySelector</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">"</span><span style="color:#C3E88D;">.div1</span><span style="color:#89DDFF;">"</span><span style="color:#A6ACCD;">)(</span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">e</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=></span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
|
||
<span class="line"><span style="color:#F07178;"> </span><span style="color:#C792EA;">let</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">e</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">e</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">||</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">window</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">event</span><span style="color:#89DDFF;">;</span></span>
|
||
<span class="line"><span style="color:#89DDFF;"> </span><span style="color:#676E95;font-style:italic;">// some code ...</span></span>
|
||
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">e</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">stopPropagation</span><span style="color:#F07178;">()</span><span style="color:#89DDFF;">;</span></span>
|
||
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">;</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><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></div></div><h3 id="📌-e-target-e-currenttarget" tabindex="-1">📌 e.target == e.currentTarget <a class="header-anchor" href="#📌-e-target-e-currenttarget" aria-hidden="true">#</a></h3><p>当使用事件代理，给目标元素的父元素添加监听回调函数时添加判断</p><p>只有当<strong>实际触发元素与回调绑定的元素相同</strong>时，才触发相关逻辑</p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">document</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">querySelector</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">"</span><span style="color:#C3E88D;">.div1</span><span style="color:#89DDFF;">"</span><span style="color:#A6ACCD;">)(</span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">e</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=></span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
|
||
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#F07178;"> (</span><span style="color:#A6ACCD;">e</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">target</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">==</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">e</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">currentTarget</span><span style="color:#F07178;">) </span><span style="color:#89DDFF;">{</span></span>
|
||
<span class="line"><span style="color:#89DDFF;"> </span><span style="color:#676E95;font-style:italic;">// some code ...</span></span>
|
||
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">}</span></span>
|
||
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">;</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><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></div></div><h3 id="📌-return-false" tabindex="-1">📌 return false <a class="header-anchor" href="#📌-return-false" aria-hidden="true">#</a></h3><p>当回调内逻辑执行完毕后，直接 <code>return false</code> 可以中止事件向上冒泡</p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">document</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">querySelector</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">"</span><span style="color:#C3E88D;">.div1</span><span style="color:#89DDFF;">"</span><span style="color:#A6ACCD;">)(</span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">e</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=></span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
|
||
<span class="line"><span style="color:#89DDFF;"> </span><span style="color:#676E95;font-style:italic;">// some code ...</span></span>
|
||
<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;font-style:italic;">return</span><span style="color:#F07178;"> </span><span style="color:#FF9CAC;">false</span><span style="color:#89DDFF;">;</span></span>
|
||
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">;</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><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></div></div><p>需要注意的是，<code>return false</code> 的方法不仅阻止了事件冒泡，而且阻止了默认事件。</p><blockquote><p><strong>默认事件</strong>：DOM元素的默认行为，选中复选框是点击复选框的默认行为。下面这个例子说明了怎样阻止默认行为的发生</p></blockquote><p>另一种阻止默认事件的方法是 <code>.preventDefault()</code></p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">document</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">querySelector</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">"</span><span style="color:#C3E88D;">.div1</span><span style="color:#89DDFF;">"</span><span style="color:#A6ACCD;">)(</span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">e</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=></span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
|
||
<span class="line"><span style="color:#89DDFF;"> </span><span style="color:#676E95;font-style:italic;">// some code ...</span></span>
|
||
<span class="line"><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">e</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">preventDefault</span><span style="color:#F07178;">()</span></span>
|
||
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">;</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><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></div></div><h2 id="相关链接" tabindex="-1">相关链接 <a class="header-anchor" href="#相关链接" aria-hidden="true">#</a></h2><p><a href="https://developer.mozilla.org/zh-CN/docs/Learn/JavaScript/Building_blocks/Events#%E4%BA%8B%E4%BB%B6%E5%86%92%E6%B3%A1%E5%8F%8A%E6%8D%95%E8%8E%B7" target="_blank" rel="noreferrer"><code>事件冒泡及捕获</code></a></p></div></div></main><!--[--><!--]--><footer class="VPDocFooter" data-v-30dabfe4 data-v-cc0f9778><div class="edit-info" data-v-cc0f9778><div class="edit-link" data-v-cc0f9778><a class="VPLink link edit-link-button" href="https://github.com/ZiuChen/ZiuChen.github.io/edit/main/docs/article/一文读懂事件冒泡与事件捕获.md" target="_blank" rel="noreferrer" data-v-cc0f9778 data-v-8dd200cc><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" data-v-cc0f9778><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page on GitHub<!--]--><!----></a></div><div class="last-updated" data-v-cc0f9778><p class="VPLastUpdated" data-v-cc0f9778 data-v-de6a4e1f>Updated Date: <time datetime="2023-02-21T11:31:03.000Z" data-v-de6a4e1f></time></p></div></div><div class="prev-next" data-v-cc0f9778><div class="pager" data-v-cc0f9778><a class="pager-link prev" href="/article/%E3%80%90%E7%94%A8%E5%8F%8B%E9%87%91%E8%9E%8D%E3%80%91%E5%89%8D%E7%AB%AF%E9%9D%A2%E8%AF%95%E9%A2%98%E6%80%BB%E7%BB%93.html" data-v-cc0f9778><span class="desc" data-v-cc0f9778>Previous page</span><span class="title" data-v-cc0f9778>【用友金融】前端面试题总结</span></a></div><div class="has-prev pager" data-v-cc0f9778><a class="pager-link next" href="/article/%E4%B8%80%E6%96%87%E8%AF%BB%E6%87%82%E4%BC%AA%E7%B1%BB%E4%B8%8E%E4%BC%AA%E5%85%83%E7%B4%A0.html" data-v-cc0f9778><span class="desc" data-v-cc0f9778>Next page</span><span class="title" data-v-cc0f9778>一文读懂伪类与伪元素</span></a></div></div></footer><!--[--><!--]--></div></div></div></div></div><footer class="VPFooter has-sidebar" data-v-3af881ed data-v-8b655284><div class="container" data-v-8b655284><p class="message" data-v-8b655284>Released under the MIT License.</p><p class="copyright" data-v-8b655284>Copyright © 2019-present Ziu Chen</p></div></footer><!--[--><!--]--></div></div>
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