# CSS3 transition-timing-function 属性 ## 实例 以相同的速度从开始到结束的过渡效果： ``` div { transition-timing-function: linear; -moz-transition-timing-function: linear; /* Firefox 4 */ -webkit-transition-timing-function: linear; /* Safari 和 Chrome */ -o-transition-timing-function: linear; /* Opera */ } ``` ## 浏览器支持 | IE | Firefox | Chrome | Safari | Opera | | --- | --- | --- | --- | --- | Internet Explorer 10、Firefox、Opera 和 Chrome 支持 transition-timing-function 属性。 Safari 支持替代的 -webkit-transition-timing-function 属性。 注释：Internet Explorer 9 以及更早版本的浏览器不支持 transition-timing-function 属性。 ## 定义和用法 transition-timing-function 属性规定过渡效果的速度曲线。 该属性允许过渡效果随着时间来改变其速度。 | 默认值： | ease | | --- | --- | | 继承性： | no | | --- | --- | | 版本： | CSS3 | | --- | --- | | JavaScript 语法： | _object_.style.transitionTimingFunction="linear" | | --- | --- | ## 语法 ``` transition-timing-function: linear|ease|ease-in|ease-out|ease-in-out|cubic- bezier(_n_,_n_,_n_,_n_); ``` | 值 | 描述 | | --- | --- | | linear | 规定以相同速度开始至结束的过渡效果（等于 cubic-bezier(0,0,1,1)）。 | | ease | 规定慢速开始，然后变快，然后慢速结束的过渡效果（cubic-bezier(0.25,0.1,0.25,1)）。 | | ease-in | 规定以慢速开始的过渡效果（等于 cubic-bezier(0.42,0,1,1)）。 | | ease-out | 规定以慢速结束的过渡效果（等于 cubic-bezier(0,0,0.58,1)）。 | | ease-in-out | 规定以慢速开始和结束的过渡效果（等于 cubic-bezier(0.42,0,0.58,1)）。 | | cubic-bezier(_n_,_n_,_n_,_n_) | 在 cubic-bezier 函数中定义自己的值。可能的值是 0 至 1 之间的数值。 | 提示：请在实例中测试不同的值，这样可以更好地理解它们的工作原理。 ## 亲自试一试 - 实例 ### 实例 1 为了更好地理解不同的函数值，请看下面带有五个不同值的五个不同的 div 元素： ``` #div1 {transition-timing-function: linear;} #div2 {transition-timing-function: ease;} #div3 {transition-timing-function: ease-in;} #div4 {transition-timing-function: ease-out;} #div5 {transition-timing-function: ease-in-out;} /* Firefox 4: */ #div1 {-moz-transition-timing-function: linear;} #div2 {-moz-transition-timing-function: ease;} #div3 {-moz-transition-timing-function: ease-in;} #div4 {-moz-transition-timing-function: ease-out;} #div5 {-moz-transition-timing-function: ease-in-out;} /* Safari and Chrome: */ #div1 {-webkit-transition-timing-function: linear;} #div2 {-webkit-transition-timing-function: ease;} #div3 {-webkit-transition-timing-function: ease-in;} #div4 {-webkit-transition-timing-function: ease-out;} #div5 {-webkit-transition-timing-function: ease-in-out;} /* Opera: */ #div1 {-o-transition-timing-function: linear;} #div2 {-o-transition-timing-function: ease;} #div3 {-o-transition-timing-function: ease-in;} #div4 {-o-transition-timing-function: ease-out;} #div5 {-o-transition-timing-function: ease-in-out;} ``` ### 实例 2 与上例相同，但通过 cubic-bezier 来规定速度曲线： ``` #div1 {transition-timing-function: cubic-bezier(0,0,1,1;} #div2 {transition-timing-function: cubic-bezier(0.25,0.1,0.25,1);} #div3 {transition-timing-function: cubic-bezier(0.42,0,1,1);} #div4 {transition-timing-function: cubic-bezier(0,0,0.58,1);} #div5 {transition-timing-function: cubic-bezier(0.42,0,0.58,1);} /* Firefox 4: */ #div1 {-moz-transition-timing-function: cubic-bezier(0,0,0.25,1);} #div2 {-moz-transition-timing-function: cubic-bezier(0.25,0.1,0.25,1);} #div3 {-moz-transition-timing-function: cubic-bezier(0.42,0,1,1);} #div4 {-moz-transition-timing-function: cubic-bezier(0,0,0.58,1);} #div5 {-moz-transition-timing-function: cubic-bezier(0.42,0,0.58,1);} /* Safari and Chrome: */ #div1 {-webkit-transition-timing-function: cubic-bezier(0,0,1,1;} #div2 {-webkit-transition-timing-function: cubic-bezier(0.25,0.1,0.25,1);} #div3 {-webkit-transition-timing-function: cubic-bezier(0.42,0,1,1);} #div4 {-webkit-transition-timing-function: cubic-bezier(0,0,0.58,1);} #div5 {-webkit-transition-timing-function: cubic-bezier(0.42,0,0.58,1);} /* Opera: */ #div1 {-o-transition-timing-function: cubic-bezier(0,0,1,1;} #div2 {-o-transition-timing-function: cubic-bezier(0.25,0.1,0.25,1);} #div3 {-o-transition-timing-function: cubic-bezier(0.42,0,1,1);} #div4 {-o-transition-timing-function: cubic-bezier(0,0,0.58,1);} #div5 {-o-transition-timing-function: cubic-bezier(0.42,0,0.58,1);} ```