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---
title: offline
slug: Web/API/Window/offline_event
translation_of: Web/API/Window/offline_event
---
<p>当浏览器失去网络连接时,<code>offline</code>事件被触发。并且<code>navigator.onLine</code>的值变为 <code>false</code>。</p>
<h2 id="常规信息">常规信息</h2>
<dl>
<dt>规范</dt>
<dd><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/offline.html#event-offline" rel="noopener">HTML5 Offline</a></dd>
<dt>接口</dt>
<dd>Event</dd>
<dt>是否冒泡</dt>
<dd>否</dd>
<dt>可取消默认行为</dt>
<dd>否</dd>
<dt>目标对象</dt>
<dd>当前网页(<code><window></code>)</dd>
<dt>默认行为</dt>
<dd>无</dd>
</dl>
<h2 id="属性">属性</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">属性</th>
<th scope="col">类型</th>
<th scope="col">描述</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>target</code> {{readonlyInline}}</td>
<td>{{domxref("EventTarget")}}</td>
<td>产生该事件的对象(DOM树中最顶级的那个对象).</td>
</tr>
<tr>
<td><code>type</code> {{readonlyInline}}</td>
<td>{{domxref("DOMString")}}</td>
<td>事件类型.</td>
</tr>
<tr>
<td><code>bubbles</code> {{readonlyInline}}</td>
<td>{{jsxref("Boolean")}}</td>
<td>该事件是否冒泡.</td>
</tr>
<tr>
<td><code>cancelable</code> {{readonlyInline}}</td>
<td>{{jsxref("Boolean")}}</td>
<td>该事件是否可取消默认行为.</td>
</tr>
</tbody>
</table>
<h2 id="相关事件">相关事件</h2>
<ul>
<li><a href="/en-US/docs/Mozilla_event_reference/online"><code>online</code></a></li>
</ul>
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