在此页

• 句法
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

This interface of this property is deprecated in the Navigation Timing Level 2 specification . Please use the PerformanceNavigationTiming interface instead.

传统 PerformanceTiming .unloadEventStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, the unload event has been thrown. If there is no previous document, or if the previous document, or one of the needed redirects, is not of the same origin, the value returned is 0 .

句法

time = performanceTiming.unloadEventStart;
					

规范

规范	状态	注释
导航计时 The definition of 'PerformanceTiming.unloadEventStart' in that specification.	推荐	初始定义。

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
unloadEventStart 弃用	Chrome 6	Edge 12	Firefox 7	IE 9	Opera 15	Safari 11	WebView Android Yes	Chrome Android 18	Firefox Android 7	Opera Android 14	Safari iOS 11	Samsung Internet Android 1.0

图例

完整支持

完整支持

弃用。不要用于新网站。

弃用。不要用于新网站。

另请参阅

• PerformanceTiming interface it belongs to.

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. 导航计时 API
2. PerformanceTiming
3. 特性

   1. connectEnd
   2. connectStart
   3. domainLookupEnd
   4. domainLookupStart
   5. domComplete
   6. domContentLoadedEventEnd
   7. domContentLoadedEventStart
   8. domInteractive
   9. domLoading
   10. fetchStart
   11. loadEventEnd
   12. loadEventStart
   13. navigationStart
   14. redirectEnd
   15. redirectStart
   16. requestStart
   17. responseEnd
   18. responseStart
   19. secureConnectionStart
   20. unloadEventEnd
   21. unloadEventStart
4. Related pages for Navigation Timing

   1. 性能
   2. PerformanceNavigation
   3. PerformanceNavigationTiming
   4. Window.performance