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+---
+title: ProgressEvent.lengthComputable
+slug: Web/API/ProgressEvent/lengthComputable
+translation_of: Web/API/ProgressEvent/lengthComputable
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p><code><strong>ProgressEvent.lengthComputable</strong></code> 只读属性是一个布尔{{domxref("Boolean")}} 标志，表示{{domxref("ProgressEvent")}} 所关联的资源是否具有可以计算的长度。否则 ，{{domxref("ProgressEvent.total")}} 属性将是一个无意义的值。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>flag</em> = <em>ProgressEvent</em>.lengthComputable</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('XMLHttpRequest', '#dom-progressevent-lengthcomputable', 'ProgressEvent.lengthComputable')}}</td>
+   <td>{{Spec2('XMLHttpRequest')}}</td>
+   <td> </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>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("1.9.1")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("1.9.1")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>The {{domxref("ProgressEvent")}} interface it belongs to.</li>
+</ul>