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实验性技术
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要小心谨慎在生产中使用这之前。
KeyframeEffect()
constructor of the
Web 动画 API
returns a new
object instance, and also allows you to clone an existing keyframe effect object instance.
KeyframeEffect
var keyframes = new KeyframeEffect(element, keyframeSet, keyframeOptions); var keyframes = new KeyframeEffect(sourceKeyFrames);
The first type of constructor (see above) creates a completely new
KeyframeEffect
object instance. Its parameters are:
null
.
null
.
Either an integer representing the animation's duration (in milliseconds), or an
对象
containing one or more of the following:
delay
可选
The number of milliseconds to delay the start of the animation. Defaults to 0.
direction
可选
normal
), backwards (
reverse
), switches direction after each iteration (
alternate
), or runs backwards and switches direction after each iteration (
alternate-reverse
). Defaults to
"normal"
.
duration
可选
The number of milliseconds each iteration of the animation takes to complete. Defaults to 0. Although this is technically optional, keep in mind that your animation will not run if this value is 0.
easing
可选
"linear"
,
"ease"
,
"ease-in"
,
"ease-out"
，和
"ease-in-out"
, or a custom
"cubic-bezier"
value like
"cubic-bezier(0.42, 0, 0.58, 1)"
. Defaults to
"linear"
.
endDelay
可选
The number of milliseconds to delay after the end of an animation. This is primarily of use when sequencing animations based on the end time of another animation. Defaults to 0.
fill
可选
"backwards"
), retained after the animation has completed playing (
"forwards"
)，或
both
. Defaults to
"none"
.
iterationStart
可选
Describes at what point in the iteration the animation should start. 0.5 would indicate starting halfway through the first iteration for example, and with this value set, an animation with 2 iterations would end halfway through a third iteration. Defaults to 0.0.
iterations
可选
1
, and can also take a value of
Infinity
to make it repeat for as long as the element exists.
composite
Determines how values are combined between this animation and the element's underlying values.
iterationComposite
Determines how values build from iteration to iteration in the current animation.
The second type of constructor (see above) creates a clone of an existing
KeyframeEffect
object instance. Its parameter is as follows:
KeyframeEffect
object that you want to clone.
在
Follow the White Rabbit example
，
KeyframeEffect
constructor is used to create a set of keyframes that dictate how the White Rabbit should animate down the hole:
var rabbitDownKeyframes = new KeyframeEffect(
whiteRabbit, // element to animate
[
{ transform: 'translateY(0%)' }, // keyframe
{ transform: 'translateY(100%)' } // keyframe
],
{ duration: 3000, fill: 'forwards' } // keyframe options
);
| 规范 | 状态 | 注释 |
|---|---|---|
|
Web Animations Level 2
The definition of 'KeyframeEffectOptions.iterationComposite' in that specification. |
草案 |
添加
iterationComposite
选项。
|
|
Web 动画
The definition of 'keyframeEffect()' in that specification. |
工作草案 | 编者草案。 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
KeyframeEffect()
构造函数
|
Chrome Yes | Edge ≤79 | Firefox 63 | IE No | Opera No | Safari No | WebView Android Yes | Chrome Android Yes | Firefox Android 63 | Opera Android No | Safari iOS No | Samsung Internet Android Yes |
完整支持
不支持
实验。期望将来行为有所改变。
KeyframeEffect
KeyframeEffect()