CSS3 transition-timing-function 属性

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# CSS3 transition-timing-function 属性

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## 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 */
    }

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## 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;}

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### 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);}

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