PerformanceObserver 用于监测性能度量事件，在浏览器的性能时间轴记录下一个新的 performance entries 的时候将会被通知 。Note: 此特性在 Web Worker 中可用。
构造函数
PerformanceObserver()- 创建并返回一个新的
PerformanceObserver对象。
方法
PerformanceObserver.observe()- 指定监测的
entry types的集合。 当performance entry被记录并且是指定的entryTypes之一的时候，性能观察者对象的回调函数会被调用。 PerformanceObserver.disconnect()- 性能监测回调停止接收 性能条目。
示例
function perf_observer(list, observer) {
// Process the "measure" event
// 处理 "measure" 事件
}
var observer2 = new PerformanceObserver(perf_observer);
observer2.observe({entryTypes: ["measure"]});
规范
| 规范草案 | 状态 | 注释 |
|---|---|---|
| Performance Timeline Level 2 PerformanceObserver |
Candidate Recommendation | PerformanceObserver 接口的初始定义 |
浏览器兼容性
此页面上的兼容性表是根据结构化数据生成的。 如果您想为数据做出贡献，请查看https://github.com/mdn/browser-compat-data并向我们发送拉取请求。
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
PerformanceObserver | Chrome Full support 52 | Edge ? | Firefox Full support 57 | IE No support No | Opera Full support 39 | Safari Full support 11 | WebView Android Full support 52 | Chrome Android Full support 52 | Firefox Android Full support 57 | Opera Android Full support 41 | Safari iOS Full support 11 | Samsung Internet Android ? |
PerformanceObserver() constructor | Chrome Full support 52 | Edge ? | Firefox Full support 57 | IE No support No | Opera Full support 39 | Safari Full support 11 | WebView Android Full support 52 | Chrome Android Full support 52 | Firefox Android Full support 57 | Opera Android Full support 41 | Safari iOS Full support 11 | Samsung Internet Android ? |
disconnect | Chrome Full support 52 | Edge ? | Firefox Full support 57 | IE No support No | Opera Full support 39 | Safari Full support 11 | WebView Android Full support 52 | Chrome Android Full support 52 | Firefox Android Full support 57 | Opera Android Full support 41 | Safari iOS Full support 11 | Samsung Internet Android ? |
observe | Chrome Full support 52 | Edge ? | Firefox Full support 57 | IE No support No | Opera Full support 39 | Safari Full support 11 | WebView Android Full support 52 | Chrome Android Full support 52 | Firefox Android Full support 57 | Opera Android Full support 41 | Safari iOS Full support 11 | Samsung Internet Android ? |
supportedEntryTypes | Chrome Full support 73 | Edge ? | Firefox ? | IE No support No | Opera Full support Yes | Safari ? | WebView Android Full support 73 | Chrome Android Full support 73 | Firefox Android ? | Opera Android Full support Yes | Safari iOS ? | Samsung Internet Android ? |
takeRecords | Chrome Full support 65 | Edge ? | Firefox Full support 60 | IE No support No | Opera Full support Yes | Safari No support No | WebView Android Full support 65 | Chrome Android Full support 65 | Firefox Android Full support 60 | Opera Android Full support Yes | Safari iOS No support No | Samsung Internet Android ? |
| Available in workers | Chrome Full support 62 | Edge ? | Firefox ? | IE No support No | Opera Full support 49 | Safari ? | WebView Android Full support 62 | Chrome Android Full support 62 | Firefox Android ? | Opera Android Full support 46 | Safari iOS ? | Samsung Internet Android ? |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.