这是
实验性技术
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要小心谨慎在生产中使用这之前。
setKeyframes()
方法在
KeyframeEffect
interface replaces the keyframes that make up the affected
KeyframeEffect
with a new set of keyframes.
existingKeyframeEffect.setKeyframes(keyframes);
null
。若设为
null
, the keyframes are replaced with a sequence of empty keyframes.
There are two different ways to format keyframes:
An
array
of objects (keyframes) consisting of properties and values to iterate over. This is the canonical format returned by the
getKeyframes()
方法。
element.animate([
{ // from
opacity: 0,
color: "#fff"
},
{ // to
opacity: 1,
color: "#000"
}
], 2000);
Offsets for each keyframe can be specified by providing an
offset
值。
element.animate([ { opacity: 1 },
{ opacity: 0.1, offset: 0.7 },
{ opacity: 0 } ],
2000);
注意
:
offset
values, if provided, must be between 0.0 and 1.0 (inclusive) and arranged in ascending order.
It is not necessary to specify an offset for every keyframe. Keyframes without a specified offset will be evenly spaced between adjacent keyframes.
The easing to apply between keyframes can be specified by providing an
easing
value as illustrated below.
element.animate([ { opacity: 1, easing: 'ease-out' },
{ opacity: 0.1, easing: 'ease-in' },
{ opacity: 0 } ],
2000);
In this example, the specified easing only applies from the keyframe where it is specified until the next keyframe. Any
easing
value specified on the
选项
argument, however, applies across a single iteration of the animation — for the entire duration.
An
对象
containing key-value pairs consisting of the property to animate and an
array
of values to iterate over.
element.animate({
opacity: [ 0, 1 ], // [ from, to ]
color: [ "#fff", "#000" ] // [ from, to ]
}, 2000);
Using this format, the number of elements in each array does not need to be equal. The provided values will be spaced out independently.
element.animate({
opacity: [ 0, 1 ], // offset: 0, 1
backgroundColor: [ "red", "yellow", "green" ], // offset: 0, 0.5, 1
}, 2000);
The special keys
offset
,
easing
，和
composite
(described below) may be specified alongside the property values.
element.animate({
opacity: [ 0, 0.9, 1 ],
offset: [ 0, 0.8 ], // Shorthand for [ 0, 0.8, 1 ]
easing: [ 'ease-in', 'ease-out' ],
}, 2000);
After generating a suitable set of keyframes from the property value lists, each supplied offset is applied to the corresponding keyframe. If there are insufficient values, or if the list contains
null
values, the keyframes without specified offsets will be evenly spaced as with the array format described above.
If there are too few
easing
or
composite
values, the corresponding list will be repeated as needed.
In newer browser versions, you are able to set a beginning or end state for an animation only (i.e. a single keyframe), and the browser will infer the other end of the animation if it is able to. For example, consider this simple animation — the Keyframe object looks like so:
let rotate360 = [
{ transform: 'rotate(360deg)' }
];
We have only specified the end state of the animation, and the beginning state is implied.
Keyframes may specify property-value pairs for any of the
animatable css properties
. The property names are specified using camel-case so for example
background-color
becomes
backgroundColor
and
background-position-x
becomes
backgroundPositionX
. Shorthand values such as
margin
are also permitted.
Two exceptional CSS properties are:
float
, which must be written as
cssFloat
since "float" is a reserved word in JavaScript. It's just for reference here, this will have no effect on animation since "float" is not an animatable CSS property.
offset
, which must be written as
cssOffset
since "offset" represents the keyframe offset as described below.
The following special attributes may also be specified:
The offset of the keyframe specified as a number between
0.0
and
1.0
inclusive or
null
. This is equivalent to specifying start and end states in percentages in CSS stylesheets using
@keyframes
. If this value is
null
or missing, the keyframe will be evenly spaced between adjacent keyframes.
timing function used from this keyframe until the next keyframe in the series.
KeyframeEffect.composite
operation used to combine the values specified in this keyframe with the underlying value. This will be
auto
if the composite operation specified on the effect is being used.
Void.
| 异常 | 解释 |
|---|---|
TypeError
|
One or more of the frames were not of the correct type of object, the keyframes were not loosely sorted by offset , or a keyframe existed with an offset of less than 0 or more than 1. |
注意
: If the keyframes cannot be processed or are malformed, the
KeyframeEffect
's keyframes are not modified.
// passing an array of keyframe objects
existingKeyframeEffect.setKeyframes(
[
{ color: 'blue' },
{ color: 'green', left: '10px' }
]
);
// passing an object with arrays for values
existingKeyframeEffect.setKeyframes(
{
color: ['blue', 'green'],
left: [ '0', '10px']
}
);
// passing a single-member object
existingKeyframeEffect.setKeyframes(
{
color: 'blue'
}
);
| 规范 | 状态 | 注释 |
|---|---|---|
|
Web 动画
The definition of 'KeyframeEffect.setKeyframes()' in that specification. |
工作草案 | 编者草案。 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
setKeyframes
|
Chrome No | Edge No | Firefox 63 | IE No | Opera No | Safari No | WebView Android No | Chrome Android No | Firefox Android 63 | Opera Android No | Safari iOS No | Samsung Internet Android No |
完整支持
不支持
实验。期望将来行为有所改变。
KeyframeEffect
getKeyframes()
setKeyframes()