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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>
{{Compat("api.ProgressEvent.lengthComputable")}}
<h2 id="See_also">See also</h2>
<ul>
<li>The {{domxref("ProgressEvent")}} interface it belongs to.</li>
</ul>
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