animation-timing-function

概述

CSS animation-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> (en-US)

对于关键帧动画来说,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。

/* 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;

通常用animation简写定义整个动画属性更为方便。

初始值ease
适用元素all elements, ::before and ::after pseudo-elements
是否是继承属性
计算值as specified
Animation typeNot animatable

语法

<timingfunction>

每个 <timing-function> (en-US)代表了应用于动画的 timing function,定义于animation-property.

正式语法

animation-timing-function = 
<easing-function>#

<easing-function> =
linear |
<linear-easing-function> |
<cubic-bezier-easing-function> |
<step-easing-function>

<linear-easing-function> =
linear( <linear-stop-list> )

<cubic-bezier-easing-function> =
ease |
ease-in |
ease-out |
ease-in-out |
cubic-bezier( <number [0,1]> , <number> , <number [0,1]> , <number> )

<step-easing-function> =
step-start |
step-end |
steps( <integer> [, <step-position> ]? )

<linear-stop-list> =
[ <linear-stop> ]#

<step-position> =
jump-start |
jump-end |
jump-none |
jump-both |
start |
end

<linear-stop> =
<number> &&
<linear-stop-length>?

<linear-stop-length> =
<percentage>{1,2}

示例

规范

Specification
Unknown specification
# animation-timing-function

浏览器兼容性

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参见