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---
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>
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