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。
动画
.currentTime
特性为
Web 动画 API
returns and sets the current time value of the animation in milliseconds, whether running or paused.
If the animation lacks a
timeline
, is inactive, or hasn't been played yet,
currentTime
's return value is
null
.
var currentTime = Animation.currentTime; Animation.currentTime = newTime;
A number representing the current time in milliseconds, or
null
to deactivate the animation.
在
Drink Me/Eat Me game
, Alice's height is animated so it can go from small to large or large to small. At the start of the game, her height is set between the two extremes by setting her animation's
currentTime
to half her
KeyframeEffect
's duration
:
aliceChange.currentTime = aliceChange.effect.timing.duration / 2;
A more generic means of seeking to the 50% mark of an animation would be:
animation.currentTime = animation.effect.getComputedTiming().delay + animation.effect.getComputedTiming().activeDuration / 2;
To offer protection against timing attacks and fingerprinting, the precision of
animation.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 animation.currentTime; // 23.404 // 24.192 // 25.514 // ... // reduced time precision with `privacy.resistFingerprinting` enabled animation.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 | 状态 | 注释 |
|---|---|---|
|
Web 动画
The definition of 'currentTime' in that specification. |
工作草案 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
currentTime
|
Chrome 39 | Edge ≤79 | Firefox 48 | IE 不支持 No | Opera 26 | Safari 不支持 No | WebView Android 39 | Chrome Android 39 | Firefox Android 48 | Opera Android 26 | Safari iOS 不支持 No | Samsung Internet Android 4.0 |
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。
动画
for other methods and properties you can use to control web page animation.
Animation.startTime
for the time an animation is scheduled to start.
动画