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Performance 接口会给出某个页面的与时间相关的性能信息。

该类型对象可以通过调用只读属性 Window.performance 获得。

注意:该接口以及其属性存在于 Web Worker , 除了下面指出的情况。注意该接口部分还没有写入规范中(详细查看 Performance Timeline 和 User Timing 规范文档)。同时需要注意 Performance 时间标记和测量环境只能是当前 Web Worker 线程中,不能跨 Worker 标记时间,比如在新建的 Worker 线程中进行标记时间,将无法被主 Worker 线程获取。

属性

Performance 接口不从别的类继承属性。

Performance.navigation 只读 Not available to workers
是一个 PerformanceNavigation 对象代表了页面浏览上下文的导航信息,比如获取资源时的重定向。
Performance.timing 只读 Not available to workers
是一个 PerformanceTiming 对象包含了与延迟相关的性能信息。

事件

Performance.onresourcetimingbufferfull
一个 EventTarget 回调方法,当 resourcetimingbufferfull 事件触发时被调用。

方法

Performance 接口没有从别的类继承来的方法.

Performance.clearMarks()
清除浏览器的performance缓存中已经存在的的标记
Performance.clearMeasures()
Removes the given measure from the browser's performance entry buffer.
Performance.clearResourceTimings()
Removes all performance entries with a entryType of "resource" from the browser's performance data buffer.
Performance.getEntries()
Returns a list of PerformanceEntry objects based on the given filter.
Performance.getEntriesByName()
Returns a list of PerformanceEntry objects based on the given name and entry type.
Performance.getEntriesByType()
Returns a list of PerformanceEntry objects of the given entry type.
Performance.mark()
Creates a timestamp in the browser's performance entry bufferwith the given name.
Performance.measure()
Creates a named timestamp in the browser's performance entry buffer between two specified marks (known as the start mark and end mark, respectively).
Performance.now()
返回一个 DOMHighResTimeStamp 类实例表示距离页面开始请求到现在相差的毫秒数(即 Date.now() - Performance.timing.navigationStart )。
Performance.setResourceTimingBufferSize()
Sets the browser's resource timing buffer size to the specified number of "resource" type performance entry objects.
Performance.toJSON() Not available to workers
Is a jsonizer returning a json object representing the Performance object.

Specifications

Specification Status Comment
High Resolution Time Level 2
toJSON()
Candidate Recommendation Defines toJson() method.
High Resolution Time
Performance
Recommendation Defines now() method.
Navigation Timing
Performance
Recommendation Defines timing and navigation properties.
Performance Timeline Time Level 2
Performance extensions
Editor's Draft Changes getEntries() interface.
Performance Timeline
Performance extensions
Recommendation Defines getEntries(), getEntriesByType() and getEntriesByName() methods.
Resource Timing Level 1
Performance extensions
Candidate Recommendation Defines clearResourceTimings() and setResourceTimingBufferSize() methods and the onresourcetimingbufferfull property.
User Timing Level 2
Performance extensions
Editor's Draft Clarifies mark(), clearMark(), measure() and clearMeasure() methods.
User Timing
Performance extensions
Recommendation Defines mark(), clearMark(), measure() and clearMeasure() methods.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (timing attribute) 6.0 [1] (Yes) 7.0 (7.0) 9.0 15.0 8
navigation attribute 9 ? 7 (7) 9.0 15 8
now() on regular context 20.0 -webkit
24.0
? 15.0 (15.0) 10.0 (Yes) 8
now() in Web workers. 33.0 ? 34.0 (34.0) ? (Yes) 未实现
toJSON() 未实现 ? 25.0 (25.0) 9.0 未实现 未实现
getEntries(), getEntriesByType(), getEntriesByName() (Yes) ? (Yes) (Yes) (Yes) 11
clearResourceTimings(), setResourceTimingBufferSize() (Yes) ? (Yes) (Yes) (Yes) 未实现
onresourcetimingbufferfull (Yes) ? (Yes) 未实现 (Yes) 未实现
mark(), clearMarks(), measure(), clearMeasure() 43.0 ? 41 10 33 未实现
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support (Yes) (Yes) (Yes) 7.0 (7.0) 1.0 (7.0) 9.0 15.0 9 (Yes)
navigation attribute 未实现 (Yes) ? 未实现 未实现 9.0 (Yes) 9 (Yes)
now() on regular context   25.0 ? 15.0 (15.0) 1.0 (15.0) 10.0 (Yes) 9 20.0 webkit
25.0
now() in Web workers. 未实现 (Yes) ? 34.0 (34.0) ? ? ? ? (Yes)
toJSON() 未实现 未实现 ? 25.0 (25.0) 1.2 (25.0) 10.0 未实现 ? 未实现
getEntries(), getEntriesByType(), getEntriesByName() 4.4 (Yes) ? 25.0 (25.0) 1.2 (25.0) 10.0 33 11 59
clearResourceTimings(), setResourceTimingBufferSize() 未实现 (Yes) ? (Yes) (Yes) (Yes) 33 未实现 (Yes)
onresourcetimingbufferfull 未实现 (Yes) ? (Yes) ? 未实现 33 未实现 (Yes)
mark(), clearMarks(), measure(), clearMeasure() 未实现 46.0 ? 42 42 10 33 未实现 46.0

[1] Member prefixed with webkit have been removed or deprecated.

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