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---
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>
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