在此页

• 值
• Reduced time precision
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

currentTime 只读特性在 AnimationPlaybackEvent interface represents the current time of the animation that generated the event at the moment the event is queued. This will be unresolved if the animation was idle at the time the event was generated.

值

A number representing the current time in milliseconds, or null .

Reduced time precision

To offer protection against timing attacks and fingerprinting, the precision of playbackEvent.currentTime might get rounded depending on browser settings.
In Firefox, the privacy.reduceTimerPrecision preference is enabled by default and defaults to 20us in Firefox 59; in 60 it will be 2ms.

// reduced time precision (2ms) in Firefox 60
playbackEvent.currentTime;
// 23.404
// 24.192
// 25.514
// ...
// reduced time precision with `privacy.resistFingerprinting` enabled
playbackEvent.currentTime;
// 49.8
// 50.6
// 51.7
// ...
					

In Firefox, you can also enabled privacy.resistFingerprinting , the precision will be 100ms or the value of privacy.resistFingerprinting.reduceTimerPrecision.microseconds , whichever is larger.

规范

规范	状态	注释
Web 动画 The definition of 'AnimationPlaybackEvent.currentTime' in that specification.	工作草案	编者草案。

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
currentTime	Chrome No	Edge No	Firefox 42	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android 42	Opera Android No	Safari iOS No	Samsung Internet Android No

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

另请参阅

• Web 动画 API
• AnimationPlayBackEvent

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. AnimationPlaybackEvent
2. 构造函数

   1. AnimationPlaybackEvent()
3. 特性

   1. currentTime
   2. timelineTime