PerformanceEntry.entryType

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

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