注意： 此特征可用于 Web 工作者 .

特性

PerformanceEntry.name 只读

A value that further specifies the value returned by the PerformanceEntry.entryType property. The value of both depends on the subtype. See property page for valid values.

PerformanceEntry.entryType 只读

DOMString representing the type of performance metric such as, for example, " mark ". See property page for valid values.

PerformanceEntry.startTime 只读

DOMHighResTimeStamp representing the starting time for the performance metric.

PerformanceEntry.duration 只读

DOMHighResTimeStamp representing the time value of the duration of the performance event.

方法

PerformanceEntry.toJSON()

Returns a JSON representation of the PerformanceEntry 对象。

范例

The following example checks all PerformanceEntry properties to see if the browser supports them and if so, write their values to the console.

function print_PerformanceEntries() {
  // Use getEntries() to get a list of all performance entries
  var p = performance.getEntries();
  for (var i=0; i < 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 < 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] + " is NOT supported");
    }
  }
}
								

规范

规范	状态	注释
Resource Timing Level 3	编者草案
Resource Timing Level 2	工作草案
Resource Timing Level 1	候选推荐	添加 PerformanceResourceTiming interface and the resource value for entryType .
Navigation Timing Level 2	工作草案
导航计时	推荐	添加 PerformanceNavigationTiming interface and the navigation value for entryType .
User Timing Level 2	工作草案
User Timing	推荐	添加 PerformanceMark and PerformanceMeasure interfaces as well as the mark and measure values for entryType .
Frame Timing	草案	添加 PerformanceFrameTiming interface and the frame value for entryType .
Performance Timeline Level 2 The definition of 'PerformanceEntry' in that specification.	候选推荐	添加 toJSON() serializer method.
性能时间线 The definition of 'PerformanceEntry' in that specification.	推荐	初始定义。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
PerformanceEntry	Chrome 46 46 25 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox Yes	IE Yes	Opera 33	Safari 11	WebView Android 46 46 Yes Prefixed Prefixed Implemented with the vendor prefix: webkit	Chrome Android 46 46 25 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 25	Opera Android 33	Safari iOS 11	Samsung Internet Android 5.0 5.0 1.5 Prefixed Prefixed Implemented with the vendor prefix: webkit
duration	Chrome Yes	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari 11	WebView Android Yes	Chrome Android Yes	Firefox Android 25	Opera Android Yes	Safari iOS 11	Samsung Internet Android Yes
entryType	Chrome Yes	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari 11	WebView Android Yes	Chrome Android Yes	Firefox Android 25	Opera Android Yes	Safari iOS 11	Samsung Internet Android Yes
名称	Chrome Yes	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari 11	WebView Android Yes	Chrome Android Yes	Firefox Android 25	Opera Android Yes	Safari iOS 11	Samsung Internet Android Yes
startTime	Chrome Yes	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari 11	WebView Android Yes	Chrome Android Yes	Firefox Android 25	Opera Android Yes	Safari iOS 11	Samsung Internet Android Yes
toJSON	Chrome Yes	Edge 16	Firefox Yes	IE 不支持 No	Opera Yes	Safari 11	WebView Android Yes	Chrome Android Yes	Firefox Android 25	Opera Android Yes	Safari iOS 11	Samsung Internet Android Yes
Available in workers	Chrome 62	Edge ≤79	Firefox 60	IE ?	Opera 49	Safari ?	WebView Android 62	Chrome Android 62	Firefox Android 60	Opera Android 46	Safari iOS ?	Samsung Internet Android 8.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

元数据

• 最后修改： 2019 年 3 月 23 日