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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: online
+slug: Web/API/Window/online_event
+translation_of: Web/API/Window/online_event
+---
+<p>当浏览器能够访问网络, 并且<code>navigator.online</code>的值被设为<code>true</code>时, <code>online</code>事件被触发.</p>
+
+<div class="note"><strong>注意:</strong> 该事件不能用来决定某个网站可否访问.网站自身问题或防火墙或GFW都依然有可能阻止该网站的访问.</div>
+
+<h2 id="常规信息">常规信息</h2>
+
+<dl>
+ <dt style="float: left; text-align: right; width: 120px;">规范</dt>
+ <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/offline.html#event-online">HTML5 Offline</a></dd>
+ <dt style="float: left; text-align: right; width: 120px;">接口</dt>
+ <dd style="margin: 0 0 0 120px;">Event</dd>
+ <dt style="float: left; text-align: right; width: 120px;">是否冒泡</dt>
+ <dd style="margin: 0 0 0 120px;">否</dd>
+ <dt style="float: left; text-align: right; width: 120px;">可取消默认行为</dt>
+ <dd style="margin: 0 0 0 120px;">否</dd>
+ <dt style="float: left; text-align: right; width: 120px;">目标对象</dt>
+ <dd style="margin: 0 0 0 120px;">当前网页(<code>&lt;window&gt;</code>)</dd>
+ <dt style="float: left; text-align: right; width: 120px;">默认行为</dt>
+ <dd style="margin: 0 0 0 120px;">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/offline"><code>offline</code></a></li>
+</ul>