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 2017年9月.
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。
js
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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