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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>