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---
title: 网络状况 API
slug: Web/API/Network_Information_API
translation_of: Web/API/Network_Information_API
---
<div>{{SeeCompatTable}}</div>
<p>网络状态 API 可以获取到系统的网络连接信息，比如说连接方式是 WiFi 还是蜂窝。应用程序可以根据此信息为用户展现不同清晰度的内容。该 API 是由 {{domxref("NetworkInformation")}} 接口和 {{domxref("Navigator")}} 接口上新增的一个 {{domxref("Navigator.connection", "connection")}} 属性组成的。</p>
<h2 id="侦测连接状态变化">侦测连接状态变化</h2>
<p>下面是一个侦测用户设备连接状态变化的例子。</p>
<pre class="brush: js">var connection = navigator.connection || navigator.mozConnection || navigator.webkitConnection;
var type = connection.type;
function updateConnectionStatus() {
console.log("设备的网络连接从" + type + "变成了" + connection.type);
}
connection.addEventListener('change', updateConnectionStatus);
</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('Network Information', '', 'Network Information API')}}</td>
<td>{{Spec2('Network Information')}}</td>
<td>Initial specification</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{CompatibilityTable}}</p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>Firefox OS</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>2.2 {{property_prefix("webkit")}}</td>
<td>12.0<sup>[1]</sup></td>
<td>1.4</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
</tr>
</tbody>
</table>
</div>
<p>[1] 在 Firefox 中，网络状况 API 可以通过 <code>dom.netinfo.enabled</code> 偏好选项来控制开启与否。</p>
<h2 id="相关链接">相关链接</h2>
<ul>
<li>{{spec("http://w3c.github.io/netinfo/", "Network Information API Specification", "ED")}}</li>
<li><a href="/en-US/docs/Online_and_offline_events">Online and offline events</a></li>
<li>{{domxref("window.navigator.connection")}}</li>
</ul>
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