From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: PerformanceEntry
+slug: Web/API/PerformanceEntry
+tags:
+  - API
+  - Interface
+  - NeedsTranslation
+  - Reference
+  - TopicStub
+  - Web Performance
+translation_of: Web/API/PerformanceEntry
+---
+<div>{{APIRef("Performance Timeline API")}}</div>
+
+<p><strong><code>PerformanceEntry</code></strong> 对象代表了 performance 时间列表中的单个 metric 数据. 每一个 <em>performance entry 都可以在应用运行过程中通过手动构建 </em><em>{{domxref("PerformanceMark","mark")}}</em> 或者 <em>{{domxref("PerformanceMeasure","measure")}}</em> (例如调用 {{domxref("Performance.mark","mark()")}} 方法) 生成. 此外, Performance entries 在资源加载的时候，也会被动生成（例如图片、script、css等资源加载）</p>
+
+<p class="note">Note: Performance 对象暴露给了 {{domxref("Window")}} 和 {{domxref("Worker")}}. 同时该对象扩展了几个其他对象的属性，包括 {{domxref("PerformanceMark")}}, {{domxref("PerformanceMeasure")}}, {{domxref("PerformanceFrameTiming")}}, {{domxref("PerformanceNavigationTiming")}} 以及 {{domxref("PerformanceResourceTiming")}}.</p>
+
+<h2 id="Properties">Properties</h2>
+
+<dl>
+ <dt>{{domxref("PerformanceEntry.name")}} {{readonlyInline}}</dt>
+ <dd>{{domxref("DOMString")}} 该 performance entry 的名字</dd>
+ <dt>{{domxref("PerformanceEntry.entryType")}} {{readonlyInline}}</dt>
+ <dd>{{domxref("DOMString")}} 代表所上报的 performance metric 的 entryType 类型，例如 "mark". 可以通过 {{domxref("PerformanceEntry.entryType","entryType")}} 查阅完整的 entryType type 类型.</dd>
+ <dt>{{domxref("PerformanceEntry.startTime")}} {{readonlyInline}}</dt>
+ <dd> {{domxref("DOMHighResTimeStamp")}}  此为 metric 上报时的时间</dd>
+ <dt>{{domxref("PerformanceEntry.duration")}} {{readonlyInline}}</dt>
+ <dd>{{domxref("DOMHighResTimeStamp")}} 该事件的耗时</dd>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<dl>
+ <dt>{{domxref("PerformanceEntry.toJSON","PerformanceEntry.toJSON()")}}</dt>
+ <dd>返回 <code>PerformanceEntry</code> 对象的 JSON 格式数据</dd>
+ <dd> </dd>
+</dl>
+
+<h2 id="Example">Example</h2>
+
+<p>以下例子检查了当前浏览器所支持的所有 <code>PerformanceEntry</code> 属性，每个属性的检查结果都会通过 console 打印出来</p>
+
+<pre class="brush: js">function print_PerformanceEntries() {
+  // Use getEntries() to get a list of all performance entries
+  var p = performance.getEntries();
+  for (var i=0; i &lt; p.length; i++) {
+    console.log("PerformanceEntry[" + i + "]");
+    print_PerformanceEntry(p[i]);
+  }
+}
+function print_PerformanceEntry(perfEntry) {
+  var properties = ["name",
+    "entryType",
+    "startTime",
+    "duration"];
+
+  for (var i=0; i &lt; properties.length; i++) {
+    // check each property
+    var supported = properties[i] in perfEntry;
+    if (supported) {
+      var value = perfEntry[properties[i]];
+      console.log("... " + properties[i] + " = " + value);
+    } else {
+      console.log("... " + properties[i] + " = NOT supported");
+    }
+  }
+}
+</pre>
+
+<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('Performance Timeline Level 2', '#dom-performanceentry', 'PerformanceEntry')}}</td>
+   <td>{{Spec2('Performance Timeline Level 2')}}</td>
+   <td>Added <code>toJSON()</code> serializer method.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('Performance Timeline', '#dom-performanceentry', 'PerformanceEntry')}}</td>
+   <td>{{Spec2('Performance Timeline')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+<div>
+
+
+<p>{{Compat("api.PerformanceEntry")}}</p>
+</div>
+</div>
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