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                # CSS3 animation-timing-function 屬性 ## 實例 從開頭到結尾以相同的速度來播放動畫: ``` div { animation-timing-function:2s; -webkit-animation-timing-function:2s; /* Safari 和 Chrome */ } ``` ## 瀏覽器支持 | IE | Firefox | Chrome | Safari | Opera | | --- | --- | --- | --- | --- | Internet Explorer 10、Firefox 以及 Opera 支持 animation-timing-function 屬性。 Safari 和 Chrome 支持替代的 -webkit-animation-timing-function 屬性。 注釋:Internet Explorer 9 以及更早的版本不支持 animation-timing-function 屬性。 ## 定義和用法 animation-timing-function 規定動畫的速度曲線。 速度曲線定義動畫從一套 CSS 樣式變為另一套所用的時間。 速度曲線用于使變化更為平滑。 | 默認值: | ease | | --- | --- | | 繼承性: | no | | --- | --- | | 版本: | CSS3 | | --- | --- | | 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)函數的數學函數,來生成速度曲線。您能夠在該函數中使用自己的值,也可以預定義的值: | 值 | 描述 | 測試 | | --- | --- | --- | | linear | 動畫從頭到尾的速度是相同的。 | [測試](/tiy/c.asp?f=css_animation-timing-function) | | ease | 默認。動畫以低速開始,然后加快,在結束前變慢。 | [測試](/tiy/c.asp?f=css_animation-timing-function&p=2) | | ease-in | 動畫以低速開始。 | [測試](/tiy/c.asp?f=css_animation-timing-function&p=3) | | ease-out | 動畫以低速結束。 | [測試](/tiy/c.asp?f=css_animation-timing-function&p=4) | | ease-in-out | 動畫以低速開始和結束。 | [測試](/tiy/c.asp?f=css_animation-timing-function&p=5) | | cubic-bezier(_n_,_n_,_n_,_n_) | 在 cubic-bezier 函數中自己的值。可能的值是從 0 到 1 的數值。 | 提示:請試著在下面的“親自試一試”功能中使用不同的值。 ## 親自試一試 - 實例 ### 實例 1 為了更好地理解不同的定時函數值,這里提供了設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);} ``` ## 相關頁面 CSS3 教程:[CSS3 動畫](/css3/css3_animation.asp "CSS3 動畫")
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