PerformanceEntry.name

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名称 特性为 PerformanceEntry interface returns a value that further specifies the value returned by the PerformanceEntry.entryType property. This property is read only.

注意： 此特征可用于 Web 工作者 .

句法

var name = entry.name;

返回值

The return value depends on the subtype of the PerformanceEntry object and the value of PerformanceEntry.entryType , as shown by the table below.

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

范例

The following example shows the use of the 名称 特性。

function run_PerformanceEntry() {
  log("PerformanceEntry support ...");
  if (performance.mark === undefined) {
    log("... performance.mark Not supported");
    return;
  }
  // Create some performance entries via the mark() method
  performance.mark("Begin");
  do_work(50000);
  performance.mark("End");
  // Use getEntries() to iterate through the each entry
  var p = performance.getEntries();
  for (var i=0; i < p.length; i++) {
    log("Entry[" + i + "]");
    check_PerformanceEntry(p[i]);
  }
}
function check_PerformanceEntry(obj) {
  var properties = ["name", "entryType", "startTime", "duration"];
  var methods = ["toJSON"];
  for (var i=0; i < properties.length; i++) {
    // check each property
    var supported = properties[i] in obj;
    if (supported)
      log("..." + properties[i] + " = " + obj[properties[i]]);
    else
      log("..." + properties[i] + " = Not supported");
  }
  for (var i=0; i < methods.length; i++) {
    // check each method
    var supported = typeof obj[methods[i]] == "function";
    if (supported) {
      var js = obj[methods[i]]();
      log("..." + methods[i] + "() = " + JSON.stringify(js));
    } else {
      log("..." + methods[i] + " = Not supported");
    }
  }
}

规范

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

图例

完整支持

元数据

最后修改： 2019 年 3 月 23 日

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

范例

规范

浏览器兼容性

图例

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