PerformanceEntry.entryType

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The entryType  返回一个代表performance metric 类型的DOMString , 例如被performance.mark("begin") 所创建的entry 的entryType 就是 "mark". 此属性只读.

语法

var type = entry.entryType;

返回值

返回值取决于  PerformanceEntry 对象的subtype, entryType的取值会影响PerformanceEntry.name 属性, 具体如下表所示. 

Value 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 Either 'first-paint' or 'first-contentful-paint'.

 

范例

下面的代码说明了  entryType 属性的用法.

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");
  //entriesNamedBegin
  //    Array [ PerformanceMark ]
  //entriesNamedBegin[0]
  //    PerformanceMark { name: "begin", entryType: "mark", startTime: 94661370.14, duration: 0 }
  //entriesNamedBegin[0].entryType
  //    "mark"
  //entriesNamedBegin[0].name
  //    "begin"
  
  for (var i=0; i < entriesNamedBegin.length; i++) {
      var typeOfEntry = entriesNamedBegin[i].entryType;
      console.log("Entry is type: " + typeOfEntry);
  }

}

Specifications

Specification Status Comment
Performance Timeline Level 2
entryType
Candidate Recommendation  
Performance Timeline
entryType
Recommendation Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support YesEdge Full support YesFirefox Full support YesIE Full support YesOpera Full support YesSafari Full support 11WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 25Opera Android Full support YesSafari iOS Full support 11Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

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