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+---
+title: PerformanceTiming.connectStart
+slug: Web/API/PerformanceTiming/connectStart
+translation_of: Web/API/PerformanceTiming/connectStart
+---
+<p>{{APIRef("Navigation Timing")}}</p>
+
+<h2 id="概要">概要</h2>
+
+<p><code><strong>PerformanceTiming</strong></code><strong><code>.connectStart</code></strong> 是一个返回代表一个时刻的 <code>unsigned long long 型只读属性，</code>请求连接被发送到网络之时的Unix毫秒时间戳。如果传输层报告错误并且连接的建立重新开始，则把最后建立连接的开始时间作为该值。如果一个持久连接被使用，则该值与 {{domxref("PerformanceTiming.fetchStart")}} 相同。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>time</em> = <em>performanceTiming</em>.connectStart;</pre>
+
+<h2 id="标准">标准</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('Navigation Timing', '#dom-performancetiming-connectstart', 'PerformanceTiming.connectStart')}}</td>
+   <td>{{Spec2('Navigation Timing')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+<div>
+
+
+<p>{{Compat("api.PerformanceTiming.connectStart")}}</p>
+</div>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>它属于 {{domxref("PerformanceTiming")}} 接口。</li>
+</ul>