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 |