AnimationTimeline.currentTime

在此页

句法
Reduced time precision
规范
浏览器兼容性
另请参阅
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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 Web 动画 API 's AnimationTimeline interface returns the timeline's current time in milliseconds, or null if the timeline is inactive.

句法

var currentTime = AnimationTimeline.currentTime;

值

A number representing the timeline's current time in milliseconds, or null if the timeline is inactive.

Reduced time precision

To offer protection against timing attacks and fingerprinting, the precision of animationTimeline.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
animationTimeline.currentTime;
// 23.404
// 24.192
// 25.514
// ...
// reduced time precision with `privacy.resistFingerprinting` enabled
animationTimeline.currentTime;
// 49.8
// 50.6
// 51.7
// ...

In Firefox, you can also enable 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 '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 75 75 63 Disabled Disabled From version 63: this feature is behind the `dom.animations-api.timelines.enabled` preference (needs to be set to `true` ). To change preferences in Firefox, visit about:config. 不支持 48 — 63 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 13.1	WebView Android No	Chrome Android No	Firefox Android 63 Disabled 63 Disabled Disabled From version 63: this feature is behind the `dom.animations-api.timelines.enabled` preference (needs to be set to `true` ). To change preferences in Firefox, visit about:config. 不支持 48 — 63 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 13.4	Samsung Internet Android No

图例

完整支持
不支持
实验。期望将来行为有所改变。
用户必须明确启用此特征。

另请参阅

Web 动画 API
AnimationTimeline
DocumentTimeline inherits this property
Document.timeline returns a timeline object which inherits this property

元数据

最后修改： Jul 14, 2020

在此页

句法

值

Reduced time precision

规范

浏览器兼容性

图例

另请参阅

相关话题