在此页

• 特性
• 方法
• 事件
• 规范
• 浏览器兼容性
• 相关话题

性能 interface provides access to performance-related information for the current page. It's part of the High Resolution Time API, but is enhanced by the 性能时间线 API ， 导航计时 API ， 用户计时 API ，和 资源计时 API .

An object of this type can be obtained by calling the window.performance read-only attribute.

注意 : This interface and its members are available in Web 工作者 , except where indicated below. Also, note that performance markers and measures are per context. If you create a mark on the main thread (or other worker), you cannot see it in a worker thread, and vice versa.

特性

性能 interface doesn't inherit any properties.

Performance.navigation 只读

A legacy PerformanceNavigation object that provides useful context about the operations included in the times listed in timing , including whether the page was a load or a refresh, how many redirections occurred, and so forth. Not available in workers.

Performance.timing 只读

A legacy PerformanceTiming object containing latency-related performance information. Not available in workers.

Performance.memory 只读

A non-standard extension added in Chrome, this property provides an object with basic memory usage information. 您 should not use this non-standard API.

Performance.timeOrigin 只读

Returns the high resolution timestamp of the start time of the performance measurement.

方法

性能 interface doesn't inherit any 方法 .

Performance.clearMarks()

移除给定 mark from the browser's performance entry buffer.

Performance.clearMeasures()

移除给定 measure from the browser's performance entry buffer.

Performance.clearResourceTimings()

Removes all performance entries 采用 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()

创建 timestamp in the browser's performance entry buffer with 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 DOMHighResTimeStamp representing the number of milliseconds elapsed since a reference instant.

Performance.setResourceTimingBufferSize()

Sets the browser's resource timing buffer size to the specified number of " resource " type performance entry 对象。

Performance.toJSON()

Is a jsonizer returning a json object representing the 性能 对象。

事件

监听这些事件使用 addEventListener() 或通过把事件监听器赋值给 on eventname 特性为此接口。

resourcetimingbufferfull

Fired when the browser's resource timing buffer is full.
也可用凭借 onresourcetimingbufferfull 特性。

规范

规范	状态	注释
High Resolution Time Level 2 The definition of 'Performance' in that specification.	推荐	定义 toJson() 方法。
高分辨率时间 The definition of 'Performance' in that specification.	推荐	定义 now() 方法。
Performance Timeline Level 2 The definition of 'Performance extensions' in that specification.	候选推荐	变化 getEntries() 接口。
性能时间线 The definition of 'Performance extensions' in that specification.	推荐	定义 getEntries() , getEntriesByType() and getEntriesByName() 方法。
Resource Timing Level 1 The definition of 'Performance extensions' in that specification.	候选推荐	定义 clearResourceTimings() and setResourceTimingBufferSize() methods and the onresourcetimingbufferfull 特性。
User Timing Level 2 The definition of 'Performance extensions' in that specification.	工作草案	Clarifies mark() , clearMark() , measure() and clearMeasure() 方法。
User Timing The definition of 'Performance extensions' in that specification.	推荐	定义 mark() , clearMark() , measure() and clearMeasure() 方法。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
性能	Chrome 6	Edge 12	Firefox 7	IE 9	Opera 15	Safari 8	WebView Android 1	Chrome Android 18	Firefox Android 7	Opera Android 14	Safari iOS 9	Samsung Internet Android 1.0
clearMarks	Chrome 29 29 25 — 29 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox 41	IE 10	Opera 33	Safari 11	WebView Android ≤37 ≤37 ≤37 — ≤37 Prefixed Prefixed Implemented with the vendor prefix: webkit	Chrome Android 29 29 25 — 29 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 42	Opera Android 33	Safari iOS 11	Samsung Internet Android 2.0 2.0 1.5 — 2.0 Prefixed Prefixed Implemented with the vendor prefix: webkit
clearMeasures	Chrome 29 29 25 — 29 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox 41	IE 10	Opera 33	Safari 11	WebView Android Yes	Chrome Android 29 29 25 — 29 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 42	Opera Android 33	Safari iOS 11	Samsung Internet Android 2.0 2.0 1.5 — 2.0 Prefixed Prefixed Implemented with the vendor prefix: webkit
clearResourceTimings	Chrome 46 46 22 — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari 11	WebView Android 46 46 ? — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Chrome Android 46 46 25 — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android Yes	Opera Android Yes	Safari iOS 11	Samsung Internet Android 5.0 5.0 1.5 — 7.0 Prefixed Prefixed Implemented with the vendor prefix: webkit
getEntries	Chrome 28 28 25 — 36 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox Yes	IE Yes	Opera 不支持 No	Safari 11	WebView Android Yes	Chrome Android 28 28 25 — 36 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 25	Opera Android 不支持 No	Safari iOS 11	Samsung Internet Android 1.5 1.5 1.5 — 3.0 Prefixed Prefixed Implemented with the vendor prefix: webkit
getEntriesByName	Chrome 28 28 25 — 36 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox Yes	IE Yes	Opera 不支持 No	Safari 11	WebView Android Yes	Chrome Android 28 28 25 — 36 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 25	Opera Android 不支持 No	Safari iOS 11	Samsung Internet Android 1.5 1.5 1.5 — 3.0 Prefixed Prefixed Implemented with the vendor prefix: webkit
getEntriesByType	Chrome 28 28 25 — 36 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox Yes	IE Yes	Opera 15 15 15 — 23 Prefixed Prefixed Implemented with the vendor prefix: webkit	Safari 11	WebView Android Yes	Chrome Android 28 28 25 — 36 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 25	Opera Android 15 15 14 — 24 Prefixed Prefixed Implemented with the vendor prefix: webkit	Safari iOS 11	Samsung Internet Android 1.5 1.5 1.5 — 3.0 Prefixed Prefixed Implemented with the vendor prefix: webkit
mark	Chrome 28 28 25 — 28 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox 41	IE 10	Opera 33	Safari 11	WebView Android Yes	Chrome Android 28 28 25 — 28 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 42	Opera Android 33	Safari iOS 11	Samsung Internet Android 1.5
measure	Chrome 28 28 25 — 28 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox 41	IE 10	Opera 33	Safari 11	WebView Android 46	Chrome Android 28 28 25 — 28 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 42	Opera Android 33	Safari iOS 11	Samsung Internet Android 1.5
memory 非标	Chrome 7	Edge ≤79	Firefox 不支持 No	IE ?	Opera Yes	Safari 不支持 No	WebView Android Yes	Chrome Android 18	Firefox Android 不支持 No	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android 1.0
navigation 弃用	Chrome 10	Edge 12	Firefox 7	IE 9	Opera 15	Safari 8	WebView Android Yes	Chrome Android 18	Firefox Android 7	Opera Android 不支持 No	Safari iOS 9	Samsung Internet Android 1.0
now	Chrome 24 24 21 — 24 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox 15 注意事项 15 注意事项 In Firefox 57.0.4 the accuracy was reduced to 20 microseconds. In Firefox 59 the accuracy was reduced to 2 milliseconds. In Firefox 60 the accuracy was increased to 1 millisecond.	IE 10	Opera 15	Safari 8	WebView Android Yes	Chrome Android 25	Firefox Android 15 注意事项 15 注意事项 In Firefox 57.0.4 the accuracy was reduced to 20 microseconds. In Firefox 59 the accuracy was reduced to 2 milliseconds. In Firefox 60 the accuracy was increased to 1 millisecond.	Opera Android 14	Safari iOS 9	Samsung Internet Android 1.5
onresourcetimingbufferfull	Chrome 46 46 22 — 57 Alternate Name Alternate Name Uses the non-standard name: onwebkitresourcetimingbufferfull	Edge ≤79	Firefox Yes	IE 不支持 No	Opera 不支持 No	Safari 11	WebView Android 46 46 ? — 57 Alternate Name Alternate Name Uses the non-standard name: onwebkitresourcetimingbufferfull	Chrome Android 46 46 25 — 57 Alternate Name Alternate Name Uses the non-standard name: onwebkitresourcetimingbufferfull	Firefox Android Yes	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android 5.0 5.0 1.5 — 7.0 Alternate Name Alternate Name Uses the non-standard name: onwebkitresourcetimingbufferfull
resourcetimingbufferfull event	Chrome 46 46 22 — 57 Alternate Name Alternate Name Uses the non-standard name: webkitresourcetimingbufferfull	Edge ≤79	Firefox Yes	IE 不支持 No	Opera 不支持 No	Safari 11	WebView Android 46 46 ? — 57 Alternate Name Alternate Name Uses the non-standard name: webkitresourcetimingbufferfull	Chrome Android 46 46 25 — 57 Alternate Name Alternate Name Uses the non-standard name: webkitresourcetimingbufferfull	Firefox Android Yes	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android 5.0 5.0 1.5 — 7.0 Alternate Name Alternate Name Uses the non-standard name: webkitresourcetimingbufferfull
setResourceTimingBufferSize	Chrome 46 46 22 — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari 11	WebView Android 46 46 ? — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Chrome Android 46 46 25 — 57 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android Yes	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android 5.0 5.0 1.5 — 7.0 Prefixed Prefixed Implemented with the vendor prefix: webkit
timeOrigin	Chrome 62	Edge 16	Firefox 53	IE ?	Opera 49	Safari 不支持 No	WebView Android 62	Chrome Android 62	Firefox Android 53	Opera Android 46	Safari iOS 不支持 No	Samsung Internet Android 8.0
timing 弃用	Chrome 6	Edge 12	Firefox 7	IE 9	Opera 15	Safari 8	WebView Android Yes	Chrome Android 18	Firefox Android 7	Opera Android 14	Safari iOS 9	Samsung Internet Android 1.0
toJSON	Chrome 56	Edge 12	Firefox 25	IE ?	Opera 不支持 No	Safari 不支持 No	WebView Android 56	Chrome Android 56	Firefox Android 25	Opera Android 不支持 No	Safari iOS 不支持 No	Samsung Internet Android 6.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

非标。预期跨浏览器支持较差。

弃用。不要用于新网站。

弃用。不要用于新网站。

见实现注意事项。

使用非标名称。

使用非标名称。

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

元数据

• 最后修改： Jan 30, 2020

相关话题

1. 性能 API
2. 性能
3. 特性

   1. navigation
   2. onresourcetimingbufferfull
   3. timeOrigin
   4. timing
4. 方法

   1. clearMarks()
   2. clearMeasures()
   3. clearResourceTimings()
   4. getEntries()
   5. getEntriesByName()
   6. getEntriesByType()
   7. mark()
   8. measure()
   9. now()
   10. setResourceTimingBufferSize()
   11. toJSON()
5. 事件

   1. resourcetimingbufferfull
6. Related pages for High Resolution Time

   1. DOMHighResTimeStamp
   2. PerformanceEntry
   3. PerformanceMark
   4. PerformanceMeasure
   5. PerformanceNavigation
   6. PerformanceResourceTiming
   7. PerformanceTiming