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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>
{{Compat("api.Performance.timeOrigin")}}
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