动画定时功能属性 | animation-timing-function

animation-timing-function

CSSanimation-timing-function属性定义CSS动画在每一动画周期中执行的节奏。可能值为一或多个<timing-function>。

/* Keyword values */
animation-timing-function: ease;
animation-timing-function: ease-in;
animation-timing-function: ease-out;
animation-timing-function: ease-in-out;
animation-timing-function: linear;
animation-timing-function: step-start;
animation-timing-function: step-end;

/* Function values */
animation-timing-function: cubic-bezier(0.1, 0.7, 1.0, 0.1
animation-timing-function: steps(4, end
animation-timing-function: frames(10

/* Multiple animations */
animation-timing-function: ease, step-start, cubic-bezier(0.1, 0.7, 1.0, 0.1

/* Global values */
animation-timing-function: inherit;
animation-timing-function: initial;
animation-timing-function: unset;

使用速记属性animation一次性设置所有动画属性通常很方便。

Initial value	ease
Applies to	all elements, ::before and ::after pseudo-elements
Inherited	no
Media	visual
Computed value	as specified
Animation type	discrete
Canonical order	the unique non-ambiguous order defined by the formal grammar

语法

对于一个关键帧动画来说，timing function作用于一个关键帧周期而非整个动画周期，即从关键帧开始开始，到关键帧结束结束。

定义于一个关键帧区块的缓动函数(animation timing function)应用到改关键帧；另外，若该关键帧没有定义缓动函数，则使用定义于整个动画的缓动函数。

值

通常用animation-property简写定义整个动画属性更为方便。

注意：当您在一个animation-*属性上指定了多个以逗号分隔的值时，它们将以animation-name不同的方式分配给属性中指定的动画，具体取决于有多少个值。有关更多信息，请参阅设置多个动画属性值。

正式语法

<single-timing-function>#where 
<single-timing-function> = linear | <cubic-bezier-timing-function> | <step-timing-function> | <frames-timing-function>
where 
<cubic-bezier-timing-function> = ease | ease-in | ease-out | ease-in-out | cubic-bezier(<number>, <number>, <number>, <number>)
<step-timing-function> = step-start | step-end | steps(<integer>[, [ start | end ] ]?)
<frames-timing-function> = frames(<integer>)

示例

有关示例，请参阅CSS动画。

规范

Specification	Status	Comment
CSS AnimationsThe definition of 'animation-timing-function' in that specification.	Working Draft	Initial definition.

浏览器兼容性

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	(Yes)-webkit 43.0	(Yes)-webkit (Yes)	5.0 (5.0)-moz 16.0 (16.0)1	10	12 -o 12.10	4.0-webkit
frames()	No support2	?	No support2	No support	No support2	?

Feature	Android	Edge	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile	Chrome for Android
Basic support	(Yes)-webkit	(Yes)-webkit (Yes)	5.0 (5.0)-moz 16.0 (16.0)1	?	12-o	(Yes)-webkit	?
frames()	?	?	No support2	No support	(Yes)	?	(Yes)