定義和用法

animation-timing-function 規(guī)定動畫的速度曲線。

速度曲線定義動畫從一套 CSS 樣式變?yōu)榱硪惶姿玫臅r間。

速度曲線用于使變化更為平滑。

默認值：

ease ? ?

繼承性：

no ? ?

JavaScript 語法：

object.style.animationTimingFunction="linear" ? ?

語法

animation-timing-function: value;

animation-timing-function 使用名為三次貝塞爾（Cubic Bezier）函數(shù)的數(shù)學(xué)函數(shù)，來生成速度曲線。您能夠在該函數(shù)中使用自己的值，也可以預(yù)定義的值：

值 ? ? ? ? ? ? ?????????????????描述

linear ? ? ????????????????? ? ?| ?動畫從頭到尾的速度是相同的。 ? ?

ease ? ? ?? ? ? ????????? ? ? ?| 默認。動畫以低速開始，然后加快，在結(jié)束前變慢。 ? ? ??

ease-in ? ? ? ????????????? ??| 動畫以低速開始。 ? ? ??

ease-out ? ? ????????? ? ???| ?動畫以低速結(jié)束。 ? ?

ease-in-out ? ????????? ? ?| 動畫以低速開始和結(jié)束。 ? ??

cubic-bezier(n,n,n,n) ? | 在 cubic-bezier 函數(shù)中自己的值?？赡艿闹凳菑?0 到 1 的數(shù)值。 ? ?

實例 1

為了更好地理解不同的定時函數(shù)值，這里提供了設(shè)置五個不同值的五個不同的 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;}

實例 2

與上例相同，但是通過 cubic-bezier 函數(shù)來定義速度曲線：

/* 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);}