PerformanceEntry.entryType - Web API 接口参考 编辑

  

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

BCD tables only load in the browser

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.