Performance

Performance 接口可以获取到当前页面中与性能相关的信息。它是 High Resolution Time API 的一部分，同时也融合了 Performance Timeline API、Navigation Timing API、 User Timing API 和 Resource Timing API。

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

注意：除了以下指出的情况外，该接口及其成员在 Web Worker 中可用。此外，还需注意，performance 的创建和衡量都是同一环境下的。即，如果你在主线程（或者其他 worker）中创建了一个 performance，那么它在另外的 worker 线程中是不可用的；反之亦然。

属性

Performance 接口没有继承任何属性。

Performance.navigation 只读
PerformanceNavigation 对象提供了在指定的时间段里发生的操作相关信息，包括页面是加载还是刷新、发生了多少次重定向等等。Not available in workers.
Performance.timing 只读
PerformanceTiming 对象包含延迟相关的性能信息。Not available in workers.
performance.memory
其是 Chrome 添加的一个非标准扩展，这个属性提供了一个可以获取到基本内存使用情况的对象。不应该使用这个非标准的 API。
Performance.timeOrigin 只读  
返回性能测量开始时的时间的高精度时间戳。

事件处理程序

Performance.onresourcetimingbufferfull
一个回调的 EventTarget，当触发 resourcetimingbufferfull 事件的时候会被调用。

方法

Performance 接口没有继承任何方法。

Performance.clearMarks()
将给定的 mark 从浏览器的性能输入缓冲区中移除。
Performance.clearMeasures()
将给定的 measure 从浏览器的性能输入缓冲区中移除。
Performance.clearResourceTimings()
从浏览器的性能数据缓冲区中移除所有 entryType 是 "resource" 的  performance entries。
Performance.getEntries()
基于给定的 filter 返回一个 PerformanceEntry 对象的列表。
Performance.getEntriesByName()
基于给定的 name 和 entry type 返回一个 PerformanceEntry 对象的列表。
Performance.getEntriesByType()
基于给定的 entry type 返回一个 PerformanceEntry 对象的列表
Performance.mark()
根据给出 name 值，在浏览器的性能输入缓冲区中创建一个相关的timestamp
Performance.measure()
在浏览器的指定 start mark 和 end mark 间的性能输入缓冲区中创建一个指定的 timestamp
Performance.now()
返回一个表示从性能测量时刻开始经过的毫秒数 DOMHighResTimeStamp
Performance.setResourceTimingBufferSize()
将浏览器的资源 timing 缓冲区的大小设置为 "resource" type performance entry 对象的指定数量
Performance.toJSON()
其是一个 JSON 格式转化器，返回 Performance 对象的 JSON 对象

规范

Specification Status Comment
High Resolution Time Level 3
timeOrigin		 Editor's Draft Defines timeOrigin property.
High Resolution Time Level 2
toJSON()		 Recommendation Defines toJson() method.
High Resolution Time
Performance		 Recommendation Defines now() method.
Navigation Timing
Performance		 Recommendation Defines timing and navigation properties.
Performance Timeline Level 2
Performance extensions		 Candidate Recommendation 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		 Working Draft Clarifies mark(), clearMark(), measure() and clearMeasure() methods.
User Timing
Performance extensions		 Recommendation Defines mark(), clearMark(), measure() and clearMeasure() methods.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
PerformanceChrome Full support 6Edge Full support 12Firefox Full support 7IE Full support 9Opera Full support 15Safari Full support 8WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 7Opera Android Full support 14Safari iOS Full support 9Samsung Internet Android Full support 1.0
clearMarksChrome Full support 29
Full support 29
No support 25 — 29
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support 41IE Full support 10Opera Full support 33Safari Full support 11WebView Android Full support ≤37
Full support ≤37
No support ≤37 — ≤37
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Chrome Android Full support 29
Full support 29
No support 25 — 29
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support 42Opera Android Full support 33Safari iOS Full support 11Samsung Internet Android Full support 2.0
Full support 2.0
No support 1.5 — 2.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit
clearMeasuresChrome Full support 29
Full support 29
No support 25 — 29
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support 41IE Full support 10Opera Full support 33Safari Full support 11WebView Android Full support YesChrome Android Full support 29
Full support 29
No support 25 — 29
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support 42Opera Android Full support 33Safari iOS Full support 11Samsung Internet Android Full support 2.0
Full support 2.0
No support 1.5 — 2.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit
clearResourceTimingsChrome Full support 46
Full support 46
No support 22 — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support 11WebView Android Full support 46
Full support 46
No support ? — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Chrome Android Full support 46
Full support 46
No support 25 — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support YesOpera Android Full support YesSafari iOS Full support 11Samsung Internet Android Full support 5.0
Full support 5.0
No support 1.5 — 7.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit
getEntriesChrome Full support 28
Full support 28
No support 25 — 36
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support YesIE Full support YesOpera No support NoSafari Full support 11WebView Android Full support YesChrome Android Full support 28
Full support 28
No support 25 — 36
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support 25Opera Android No support NoSafari iOS Full support 11Samsung Internet Android Full support 1.5
Full support 1.5
No support 1.5 — 3.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit
getEntriesByNameChrome Full support 28
Full support 28
No support 25 — 36
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support YesIE Full support YesOpera No support NoSafari Full support 11WebView Android Full support YesChrome Android Full support 28
Full support 28
No support 25 — 36
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support 25Opera Android No support NoSafari iOS Full support 11Samsung Internet Android Full support 1.5
Full support 1.5
No support 1.5 — 3.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit
getEntriesByTypeChrome Full support 28
Full support 28
No support 25 — 36
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support YesIE Full support YesOpera Full support 15
Full support 15
No support 15 — 23
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Safari Full support 11WebView Android Full support YesChrome Android Full support 28
Full support 28
No support 25 — 36
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support 25Opera Android Full support 15
Full support 15
No support 14 — 24
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Safari iOS Full support 11Samsung Internet Android Full support 1.5
Full support 1.5
No support 1.5 — 3.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit
markChrome Full support 28
Full support 28
No support 25 — 28
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support 41IE Full support 10Opera Full support 33Safari Full support 11WebView Android Full support YesChrome Android Full support 28
Full support 28
No support 25 — 28
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support 42Opera Android Full support 33Safari iOS Full support 11Samsung Internet Android Full support 1.5
measureChrome Full support 28
Full support 28
No support 25 — 28
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support 41IE Full support 10Opera Full support 33Safari Full support 11WebView Android Full support 46Chrome Android Full support 28
Full support 28
No support 25 — 28
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support 42Opera Android Full support 33Safari iOS Full support 11Samsung Internet Android Full support 1.5
memory
Non-standard
Chrome Full support 7Edge Full support ≤79Firefox No support NoIE ? Opera Full support YesSafari No support NoWebView Android Full support YesChrome Android Full support 18Firefox Android No support NoOpera Android Full support YesSafari iOS No support NoSamsung Internet Android Full support 1.0
navigation
Deprecated
Chrome Full support 10Edge Full support 12Firefox Full support 7IE Full support 9Opera Full support 15Safari Full support 8WebView Android Full support YesChrome Android Full support 18Firefox Android Full support 7Opera Android No support NoSafari iOS Full support 9Samsung Internet Android Full support 1.0
nowChrome Full support 24
Full support 24
No support 21 — 24
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support 15
Notes
Full support 15
Notes
Notes In Firefox 57.0.4 the accuracy was reduced to 20 microseconds.
Notes In Firefox 59 the accuracy was reduced to 2 milliseconds.
Notes In Firefox 60 the accuracy was increased to 1 millisecond.
IE Full support 10Opera Full support 15Safari Full support 8WebView Android Full support YesChrome Android Full support 25Firefox Android Full support 15
Notes
Full support 15
Notes
Notes In Firefox 57.0.4 the accuracy was reduced to 20 microseconds.
Notes In Firefox 59 the accuracy was reduced to 2 milliseconds.
Notes In Firefox 60 the accuracy was increased to 1 millisecond.
Opera Android Full support 14Safari iOS Full support 9Samsung Internet Android Full support 1.5
onresourcetimingbufferfullChrome Full support 46
Full support 46
No support 22 — 57
Alternate Name
Alternate Name Uses the non-standard name: onwebkitresourcetimingbufferfull
Edge Full support ≤79Firefox Full support YesIE No support NoOpera No support NoSafari Full support 11WebView Android Full support 46
Full support 46
No support ? — 57
Alternate Name
Alternate Name Uses the non-standard name: onwebkitresourcetimingbufferfull
Chrome Android Full support 46
Full support 46
No support 25 — 57
Alternate Name
Alternate Name Uses the non-standard name: onwebkitresourcetimingbufferfull
Firefox Android Full support YesOpera Android Full support YesSafari iOS No support NoSamsung Internet Android Full support 5.0
Full support 5.0
No support 1.5 — 7.0
Alternate Name
Alternate Name Uses the non-standard name: onwebkitresourcetimingbufferfull
resourcetimingbufferfull eventChrome Full support 46
Full support 46
No support 22 — 57
Alternate Name
Alternate Name Uses the non-standard name: webkitresourcetimingbufferfull
Edge Full support ≤79Firefox Full support YesIE No support NoOpera No support NoSafari Full support 11WebView Android Full support 46
Full support 46
No support ? — 57
Alternate Name
Alternate Name Uses the non-standard name: webkitresourcetimingbufferfull
Chrome Android Full support 46
Full support 46
No support 25 — 57
Alternate Name
Alternate Name Uses the non-standard name: webkitresourcetimingbufferfull
Firefox Android Full support YesOpera Android Full support YesSafari iOS No support NoSamsung Internet Android Full support 5.0
Full support 5.0
No support 1.5 — 7.0
Alternate Name
Alternate Name Uses the non-standard name: webkitresourcetimingbufferfull
setResourceTimingBufferSizeChrome Full support 46
Full support 46
No support 22 — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support 11WebView Android Full support 46
Full support 46
No support ? — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Chrome Android Full support 46
Full support 46
No support 25 — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android Full support YesOpera Android Full support YesSafari iOS No support NoSamsung Internet Android Full support 5.0
Full support 5.0
No support 1.5 — 7.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit
timeOrigin
Experimental
Chrome Full support 62Edge Full support 16Firefox Full support 53IE ? Opera Full support 49Safari No support NoWebView Android Full support 62Chrome Android Full support 62Firefox Android Full support 53Opera Android Full support 46Safari iOS No support NoSamsung Internet Android Full support 8.0
timing
Deprecated
Chrome Full support 6Edge Full support 12Firefox Full support 7IE Full support 9Opera Full support 15Safari Full support 8WebView Android Full support YesChrome Android Full support 18Firefox Android Full support 7Opera Android Full support 14Safari iOS Full support 9Samsung Internet Android Full support 1.0
toJSONChrome Full support 56Edge Full support 12Firefox Full support 25IE ? Opera No support NoSafari No support NoWebView Android Full support 56Chrome Android Full support 56Firefox Android Full support 25Opera Android No support NoSafari iOS No support NoSamsung Internet Android Full support 6.0

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.
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.
See implementation notes.
See implementation notes.
Uses a non-standard name.
Uses a non-standard name.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.
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