PerformanceEntry.name

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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 Status Comment
Performance Timeline Level 2
name
Candidate Recommendation  
Performance Timeline
name
Recommendation Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support. (Yes) (Yes) (Yes) (Yes) (Yes) 未实现
Avaialable on workers 62 ? ? ? 49 ?
Feature Android Webview Chrome for Android Edge Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support. (Yes) (Yes) (Yes) 25.0 (25.0) 1.2 (25.0) 10.0 (Yes) 未实现
Avaialable on workers 62 62 ? ? ? ? 49 ?subtype of

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