---
title: timeout
slug: Web/API/XMLHttpRequest/timeout_event
tags:
  - XHR
  - XMLHttpRequest
  - events
  - timeout
translation_of: Web/API/XMLHttpRequest/timeout_event
---
<div>
<p><code>当进度由于预定时间到期而终止时，会触发<strong>timeout</strong></code> 事件。</p>
</div>

<table class="properties">
 <tbody>
  <tr>
   <td>冒泡</td>
   <td>否</td>
  </tr>
  <tr>
   <td>可取消</td>
   <td>否</td>
  </tr>
  <tr>
   <td>目标对象</td>
   <td>{{domxref("XMLHttpRequest")}}</td>
  </tr>
  <tr>
   <td>接口</td>
   <td>{{domxref("ProgressEvent")}}</td>
  </tr>
 </tbody>
</table>

<h2 id="示例">示例</h2>

<pre class="brush: js line-numbers  language-js"><code class="language-js">var client <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">XMLHttpRequest</span><span class="punctuation token">(</span><span class="punctuation token">)</span>
  client<span class="punctuation token">.</span><span class="function token">open</span><span class="punctuation token">(</span><span class="string token">"GET"</span><span class="punctuation token">,</span> <span class="string token">"http://www.example.org/example.txt"</span><span class="punctuation token">)</span>
  client<span class="punctuation token">.</span>ontimeout <span class="operator token">=</span> <span class="keyword token">function</span><span class="punctuation token">(</span>e<span class="punctuation token">)</span> <span class="punctuation token">{</span>
    console.error("Timeout!!")
  <span class="punctuation token">}</span>
  client<span class="punctuation token">.</span><span class="function token">send</span><span class="punctuation token">(</span><span class="punctuation token">)</span></code></pre>

<h2 id="继承">继承</h2>

<p><code>timeout</code> 事件实现了 {{domxref("ProgressEvent")}} 接口，它继承自 {{domxref("Event")}} — 它拥有在这个接口上定义的属性和方法。</p>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('XMLHttpRequest')}}</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.XMLHttpRequest.timeout_event")}}

<h2 id="相关链接">相关链接</h2>

<ul>
 <li><a href="https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest">XMLHttpRequest</a></li>
</ul>