PerformanceEntry.entryType

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句法
范例
规范
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entryType 特性返回 DOMString representing the type of performance metric such as, for example, " mark ". This property is read only.

注意： 此特征可用于 Web 工作者 .

句法

var type = entry.entryType;

返回值

The return value depends on the subtype of the PerformanceEntry object and affects the value of the PerformanceEntry.name property as shown by the table below.

Performance entry type names

值	Subtype	Type of name property	Description of name property
`frame` , `navigation`	`PerformanceFrameTiming` , `PerformanceNavigationTiming`	`URL`	The document's address.
`resource`	`PerformanceResourceTiming`	`URL`	The resolved URL of the requested resource. This value doesn't change even if the request is redirected.
`mark`	`PerformanceMark`	`DOMString`	The name used when the mark was created by calling `performance.mark()` .
`measure`	`PerformanceMeasure`	`DOMString`	name used when the measure was created by calling `performance.measure()` .
`paint`	`PerformancePaintTiming`	`DOMString`	要么 `'first-paint'` or `'first-contentful-paint'` .
`longtask`	`PerformanceLongTaskTiming`	`DOMString`	reports instances of long tasks

范例

The following example shows the use of the entryType 特性。

function run_PerformanceEntry() {
  // check for feature support before continuing
  if (performance.mark === undefined) {
    console.log("performance.mark not supported");
    return;
  }
  // Create a performance entry named "begin" via the mark() method
  performance.mark("begin");
  // Check the entryType of all the "begin" entries
  var entriesNamedBegin = performance.getEntriesByName("begin");
	for (var i=0; i < entriesNamedBegin.length; i++) {
      var typeOfEntry = entriesNamedBegin[i].entryType;
      console.log("Entry is type: " + typeOfEntry);
  }
}

规范

规范	状态	注释
Performance Timeline Level 2 The definition of 'entryType' in that specification.	候选推荐
性能时间线 The definition of 'entryType' 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
`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

图例

完整支持

元数据

最后修改： Jul 27, 2019

性能时间线
PerformanceEntry
特性
1. duration
2. entryType
3. 名称
4. startTime
方法
1. toJSON()
Related pages for Performance Timeline API

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句法

返回值

Performance entry type names

范例

规范

浏览器兼容性

图例

相关话题