PerformanceEntry.name

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

name 是 PerformanceEntry 接口的属性，此属性的返回值是 PerformanceEntry.entryType 的返回值的一个补充，例如 entry.entryType="navigation",entry.name="document". 这是一个只读属性。

Syntax

var name = entry.name;

返回值

返回值取决于PerformanceEntry 对象的 subtype 和PerformanceEntry.entryType的值，如下表所示。

Value	Subtype	entryType values	Description
`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`	Either `'first-paint'` or `'first-contentful-paint'`.

用例

下面的例子是 name 属性的用法。

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]);
  }
}
//
//例如上面 p 中一个 entry p[0] = {
//  "name": "document",
//  "entryType": "navigation",
//  "startTime": 0,
//  "duration": 3611.26,
//  "initiatorType": "navigation",
//  "nextHopProtocol": "http/1.1",
//  "workerStart": 0,
//  "redirectStart": 0,
//  "redirectEnd": 0,
//  "fetchStart": 0.32,
//  "domainLookupStart": 17.64,
//  "domainLookupEnd": 17.78,
//  "connectStart": 17.86,
//  "connectEnd": 18.1,
//  "secureConnectionStart": 0,
//  "requestStart": 18.3,
//  "responseStart": 294.06,
//  "responseEnd": 1610.3600000000001,
//  "transferSize": 97683,
//  "encodedBodySize": 97112,
//  "decodedBodySize": 97112,
//  "unloadEventStart": 1614.8372840721554,
//  "unloadEventEnd": 1619.1600105887128,
//  "domInteractive": 3110.767514889843,
//  "domContentLoadedEventStart": 3125.859851800787,
//  "domContentLoadedEventEnd": 3438.5779820633365,
//  "domComplete": 3609.999662153349,
//  "loadEventStart": 3610.017623620869,
//  "loadEventEnd": 3611.2672285754975,
//  "type": "reload",
//  "redirectCount": 0
//}

//下面的函数 check_PerformanceEntry 的参数 obj 就是上面的 p[0]
//
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");
    }
  }
}

Specifications

Specification
Performance Timeline # dom-performanceentry-name

Browser compatibility

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