PerformanceObserver.takeRecords()

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.

PerformanceObserver 接口的 takeRecords() 方法返回当前存储在性能观察器中的性能条目列表,并将其清空。

语法

js
var PerformanceEntry[] = performanceObserver.takeRecords();

参数

无。

返回值

PerformanceEntry 对象列表。

例子

js
var observer = new PerformanceObserver(function (list, obj) {
  var entries = list.getEntries();
  for (var i = 0; i < entries.length; i++) {
    // Process "mark" and "frame" events
  }
});
observer.observe({ entryTypes: ["mark", "frame"] });
var records = observer.takeRecords();
console.log(records[0].name);
console.log(records[0].startTime);
console.log(records[0].duration);

规范

Specification
Performance Timeline
# dom-performanceobserver-takerecords

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
takeRecords

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support