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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Event.composed
+slug: Web/API/Event/composed
+translation_of: Web/API/Event/composed
+---
+<p>{{SeeCompatTable}}{{APIRef("Shadow DOM")}}</p>
+
+<p>{{domxref("Event")}} 接口的只读属性 <strong><code>composed</code></strong> 返回一个 {{jsxref("Boolean")}} 值,用来指示该事件是否可以从 Shadow DOM 传递到一般的 DOM。</p>
+
+<div class="note">
+<p>注意:此属性以前命名为<code>scoped</code>。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">var <em>composed</em> = <em>Event</em>.composed;</pre>
+
+<h3 id="值">值</h3>
+
+<p>如果返回的 {{jsxref("Boolean")}} 值为 <code>true</code>,表明当事件到达 shadow DOM 的根节点(也就是 shadow DOM 中事件开始传播的第一个节点)时,事件可以从 shadow DOM 传递到一般 DOM。当然,事件要具有可传播性,即该事件的 {{domxref("Event.bubbles", "bubbles")}} 属性必须为 <code>true</code>。你也可以通过调用 {{domxref("Event.composedPath", "composedPath()")}} 来查看事件从 shadow DOM 传播到普通 DOM 的路径。</p>
+
+<p>如果属性值为 <code>false</code>,那么事件将不会跨越 shadow DOM 的边界传播。</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM WHATWG', '#dom-event-composed', 'composed')}}</td>
+ <td>{{Spec2('DOM WHATWG')}}</td>
+ <td></td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>特点</th>
+ <th>Chrome</th>
+ <th>Edge</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari (WebKit)</th>
+ </tr>
+ <tr>
+ <td>基本支持</td>
+ <td>{{CompatChrome(53.0)}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatGeckoDesktop(52)}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>特点</th>
+ <th>Android</th>
+ <th>Android Webview</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>Firefox OS</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ <th>Chrome for Android</th>
+ </tr>
+ <tr>
+ <td>基本支持</td>
+ <td>{{CompatNo}}</td>
+ <td>{{CompatChrome(53.0)}}</td>
+ <td>{{CompatGeckoMobile(52)}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatChrome(53.0)}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>