PerformanceObserver.takeRecords()

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

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