PerformanceEntry.entryType

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.

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
Performance Timeline # dom-performanceentry-entrytype

Browser compatibility

BCD tables only load in the browser