---
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>