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---
title: NetworkInformation.rtt
slug: Web/API/NetworkInformation/rtt
translation_of: Web/API/NetworkInformation/rtt
---
<p>{{apiref("Network Information API")}}{{SeeCompatTable}}</p>
<p><strong>NetworkInformation.rtt </strong>是一个只读属性，返回了当前连接下评估的往返时延（RTT, round-trip time ），并保留该值为25千分秒的最接近的整数倍。该值基于最近使用中被监测的最近保持活跃连接的应用层上的RTT测量值。它排除了到私有地址空间的连接。如果没有最近的测量数据，该值就基于底层连接技术的属性。</p>
<p>{{AvailableInWorkers}}</p>
<h2 id="Syntax">Syntax</h2>
<pre class="syntaxbox"><em>rtt</em> = NetworkInformation.rtt</pre>
<h3 id="Return_value">Return value</h3>
<p>一个数字。</p>
<h2 id="Specifications">Specifications</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', '#dom-networkinformation-rtt', 'rtt')}}</td>
<td>{{Spec2('Network Information')}}</td>
<td>Initial definition</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</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>{{CompatChrome(61)}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatOpera(48)}}</td>
<td>{{CompatNo}}</td>
</tr>
<tr>
<td>Available in workers</td>
<td>{{CompatChrome(61)}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatOpera(48)}}</td>
<td>{{CompatNo}}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android Webview</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatChrome(50)}}</td>
<td>{{CompatChrome(38)}}</td>
<td>{{CompatGeckoMobile("31")}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatOperaMobile(37)}}</td>
<td>{{CompatNo}}</td>
</tr>
<tr>
<td>Available in workers</td>
<td>{{CompatChrome(50)}}</td>
<td>{{CompatChrome(38)}}</td>
<td>{{CompatGeckoMobile("53")}}</td>
<td>{{CompatNo}}</td>
<td>{{CompatOperaMobile(37)}}</td>
<td>{{CompatNo}}</td>
</tr>
</tbody>
</table>
</div>
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