---
title: KeyboardEvent.isComposing
slug: Web/API/KeyboardEvent/isComposing
tags:
  - API
  - DOM
  - KeyboardEvent
  - events
  - 键盘事件
translation_of: Web/API/KeyboardEvent/isComposing
---
<p>{{APIRef("DOM Events")}}</p>

<p><code><strong>KeyboardEvent.isComposing</strong></code> 只读属性，返回一个 {{jsxref("Boolean")}} 值，表示该事件是否在 {{event("compositionstart")}} 之后和 {{event("compositionend")}} 之前被触发。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">var <em>bool</em> = <em>event</em>.isComposing;</pre>

<h2 id="示例">示例</h2>

<pre class="brush: js">var kbdEvent = new KeyboardEvent("syntheticKey", false);
console.log(kbdEvent.isComposing); // return false
</pre>

<h2 id="Specifications" name="Specifications">标准</h2>

<table class="standard-table" style="height: 49px; width: 1000px;">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('DOM3 Events','#widl-KeyboardEvent-isComposing','KeyboardEvent.isComposing')}}</td>
   <td>{{Spec2('DOM3 Events')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

<p>{{ CompatibilityTable() }}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>特性</th>
   <th>Chrome</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(56.0) }}</td>
   <td>{{ CompatGeckoDesktop("31.0") }}</td>
   <td>{{ CompatNo() }}</td>
   <td>{{ CompatOpera(43) }}</td>
   <td>{{ CompatNo() }}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>特性</th>
   <th>Android Webview</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Phone</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
   <th>Chrome for Android</th>
  </tr>
  <tr>
   <td>基本支持</td>
   <td>{{ CompatChrome(56.0) }}</td>
   <td>{{ CompatGeckoMobile("31.0") }}</td>
   <td>{{ CompatNo() }}</td>
   <td>{{ CompatOperaMobile(43) }}</td>
   <td>{{ CompatNo() }}</td>
   <td>{{ CompatChrome(56.0) }}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 class="note" id="参考">参考</h2>

<ul>
 <li>{{ event("compositionstart") }} 与 {{ event("compositionend")}}</li>
 <li>{{domxref("KeyboardEvent")}}</li>
</ul>