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---
title: Performance.timeOrigin
slug: Web/API/Performance/timeOrigin
translation_of: Web/API/Performance/timeOrigin
---
<p>{{SeeCompatTable}}{{APIRef("High Resolution Time")}}</p>
<p>接口 {{domxref("Performance")}} 的只读属性 <strong><code>timeOrigin</code></strong> 返回一个表示 the performance measurement 开始时间的高精度 timestamp</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">var <em>timeOrigin</em> = performance.timeOrigin</pre>
<h3 id="值">值</h3>
<p>高精度 timestamp，例如 1518354643295.86</p>
<h2 id="Specifications">Specifications</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('Highres Time Level 3','#dom-performance-timeorigin','timeOrigin')}}</td>
<td>{{Spec2('Highres Time Level 3')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="Browser_Compatibility">Browser Compatibility</h2>
<div>{{CompatibilityTable}}</div>
<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 (WebKit)</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatChrome(62)}}</td>
<td>{{CompatGeckoDesktop(59)}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatOpera(49)}}</td>
<td>{{CompatUnknown}}</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(62)}}</td>
<td>{{CompatChrome(62)}}</td>
<td>{{CompatGeckoMobile(59)}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatOperaMobile(49)}}</td>
<td>{{CompatUnknown}}只读属性 <strong><code><font face="Courier New">timeOrigin</font></code></strong> timestampperformance.timeOrigin</td>
</tr>
</tbody>
</table>
</div>
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