animation-timing-function里的一些属性我看不懂啊

语法里面有贝塞尔曲线bezier(

慕前端9918592

2016-07-28

源自：十天精通CSS3 9-4

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Einson 回答被采纳 +3 积分
2016-07-29

定义和用法

animation-timing-function 规定动画的速度曲线。

速度曲线定义动画从一套 CSS 样式变为另一套所用的时间。

速度曲线用于使变化更为平滑。

默认值：

ease

继承性：

JavaScript 语法：

object.style.animationTimingFunction="linear"

语法

animation-timing-function: value;

animation-timing-function 使用名为三次贝塞尔（Cubic Bezier）函数的数学函数，来生成速度曲线。您能够在该函数中使用自己的值，也可以预定义的值：

值描述

linear | 动画从头到尾的速度是相同的。

ease | 默认。动画以低速开始，然后加快，在结束前变慢。

ease-in | 动画以低速开始。

ease-out | 动画以低速结束。

ease-in-out | 动画以低速开始和结束。

cubic-bezier(n,n,n,n) | 在 cubic-bezier 函数中自己的值。可能的值是从 0 到 1 的数值。

实例 1

为了更好地理解不同的定时函数值，这里提供了设置五个不同值的五个不同的 div 元素：

/* W3C 和 Opera: */#div1 {animation-timing-function: linear;}
#div2 {animation-timing-function: ease;}
#div3 {animation-timing-function: ease-in;}
#div4 {animation-timing-function: ease-out;}
#div5 {animation-timing-function: ease-in-out;}/* Firefox: */#div1 {-moz-animation-timing-function: linear;}
#div2 {-moz-animation-timing-function: ease;}
#div3 {-moz-animation-timing-function: ease-in;}
#div4 {-moz-animation-timing-function: ease-out;}
#div5 {-moz-animation-timing-function: ease-in-out;}/* Safari 和 Chrome: */#div1 {-webkit-animation-timing-function: linear;}
#div2 {-webkit-animation-timing-function: ease;}
#div3 {-webkit-animation-timing-function: ease-in;}
#div4 {-webkit-animation-timing-function: ease-out;}
#div5 {-webkit-animation-timing-function: ease-in-out;}

实例 2

与上例相同，但是通过 cubic-bezier 函数来定义速度曲线：

/* W3C 和 Opera: */#div1 {animation-timing-function: cubic-bezier(0,0,1,1);}
#div2 {animation-timing-function: cubic-bezier(0.25,0.1,0.25,1);}
#div3 {animation-timing-function: cubic-bezier(0.42,0,1,1);}
#div4 {animation-timing-function: cubic-bezier(0,0,0.58,1);}
#div5 {animation-timing-function: cubic-bezier(0.42,0,0.58,1);}/* Firefox: */#div1 {-moz-animation-timing-function: cubic-bezier(0,0,1,1);}
#div2 {-moz-animation-timing-function: cubic-bezier(0.25,0.1,0.25,1);}
#div3 {-moz-animation-timing-function: cubic-bezier(0.42,0,1,1);}
#div4 {-moz-animation-timing-function: cubic-bezier(0,0,0.58,1);}
#div5 {-moz-animation-timing-function: cubic-bezier(0.42,0,0.58,1);}/* Safari 和 Chrome: */#div1 {-webkit-animation-timing-function: cubic-bezier(0,0,1,1);}
#div2 {-webkit-animation-timing-function: cubic-bezier(0.25,0.1,0.25,1);}
#div3 {-webkit-animation-timing-function: cubic-bezier(0.42,0,1,1);}
#div4 {-webkit-animation-timing-function: cubic-bezier(0,0,0.58,1);}
#div5 {-webkit-animation-timing-function: cubic-bezier(0.42,0,0.58,1);}