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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>