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Home > Web Front-end > HTML Tutorial > css3 animation实现逐帧动画

css3 animation实现逐帧动画

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Release： 2016-06-01 14:32:56
Original
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css3里面的animation属性非常强大，但是自己用的比较少，最近有次面试就刚好被问到了，趁现在有时间就对animation做一个小总结。同时实现一个逐帧动画的demo作为练习

animation属性一览

因为animation属性比较多，然后在w3c上看有点蛋疼，干脆也做了一份导图，以后想查看，就一目了然了

 animation属性一览

使用animation实现逐帧动画

熟悉了animation的属性之后，得找个简单的小项目实现下，逐帧动画好有意思，先跑一个满足下自己
思路很简单，就是给元素一个雪碧图的背景，然后添加的帧动画更改background-position，关键代码：

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@keyframes run{

    from{

        background-position: 0 0;

    }

    to{

        background-position: -1540px 0 ;

    }

}

div{

    width:140px;

    height:140px;

    background: url(run.png) ;

    animation-name：run;

    animation-duration:1s;

    animation-iteration-count:infinite;

}

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但是跑起来后我们发现，每帧动画之间帧动画都是滑动，并不是我们要的效果,为什么呢？
原来animation默认以ease方式过渡，它会在每个关键帧之间插入补间动画，所以动画效果是连贯性的
知道原因就好办了，解决思路就是：

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@keyframes run{

    0%, 8%{  /*动作一*/  }

    9.2%, 17.2%{  /*动作二*/  }

    ...

}

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step1：动作之间停留8帧，0%设置动作一，动作一结束在8%
step2：动作之间过渡1.2帧，9.2%设置动作二，动作二结束在17.2%

完整代码：

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<span style="color: #008080;"> 1</span> <span style="color: #0000ff;"><!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 2</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">html </span><span style="color: #ff0000;">lang</span><span style="color: #0000ff;">="en"</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 3</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 4</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="UTF-8"</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 5</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>css3逐帧动画<span style="color: #0000ff;"></</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 6</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 7</span> <span style="background-color: #f5f5f5; color: #800000;">    @keyframes run</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 8</span> <span style="background-color: #f5f5f5; color: #ff0000;">    0%, 8%{  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 9</span> <span style="background-color: #f5f5f5; color: #800000;">    9.2%, 17.2%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -140px 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">10</span> <span style="background-color: #f5f5f5; color: #800000;">    18.4%, 26.4%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -280px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">11</span> <span style="background-color: #f5f5f5; color: #800000;">    27.6%, 35.6%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -420px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">12</span> <span style="background-color: #f5f5f5; color: #800000;">    36.8%, 44.8%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -560px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">13</span> <span style="background-color: #f5f5f5; color: #800000;">    46%, 54%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -700px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">14</span> <span style="background-color: #f5f5f5; color: #800000;">    55.2%, 63.2%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -840px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">15</span> <span style="background-color: #f5f5f5; color: #800000;">    64.4%, 72.4%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -980px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">16</span> <span style="background-color: #f5f5f5; color: #800000;">    73.6%, 81.6%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1120px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">17</span> <span style="background-color: #f5f5f5; color: #800000;">    82.8%, 90.8%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1400px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">18</span> <span style="background-color: #f5f5f5; color: #800000;">    92%, 100%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1540px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">19</span> <span style="background-color: #f5f5f5; color: #800000;">    }

</span><span style="color: #008080;">20</span> <span style="background-color: #f5f5f5; color: #800000;">    @-webkit-keyframes run</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;">21</span> <span style="background-color: #f5f5f5; color: #ff0000;">    0%, 8%{  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">22</span> <span style="background-color: #f5f5f5; color: #800000;">    9.2%, 17.2%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -140px 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">23</span> <span style="background-color: #f5f5f5; color: #800000;">    18.4%, 26.4%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -280px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">24</span> <span style="background-color: #f5f5f5; color: #800000;">    27.6%, 35.6%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -420px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">25</span> <span style="background-color: #f5f5f5; color: #800000;">    36.8%, 44.8%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -560px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">26</span> <span style="background-color: #f5f5f5; color: #800000;">    46%, 54%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -700px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">27</span> <span style="background-color: #f5f5f5; color: #800000;">    55.2%, 63.2%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -840px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">28</span> <span style="background-color: #f5f5f5; color: #800000;">    64.4%, 72.4%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -980px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">29</span> <span style="background-color: #f5f5f5; color: #800000;">    73.6%, 81.6%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1120px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">30</span> <span style="background-color: #f5f5f5; color: #800000;">    82.8%, 90.8%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1400px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">31</span> <span style="background-color: #f5f5f5; color: #800000;">    92%, 100%</span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">  background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1540px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>  <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">32</span> <span style="background-color: #f5f5f5; color: #800000;">    }

</span><span style="color: #008080;">33</span> <span style="background-color: #f5f5f5; color: #800000;">    div</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;">34</span> <span style="background-color: #f5f5f5; color: #ff0000;">        width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">140px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;">35</span> <span style="background-color: #f5f5f5; color: #ff0000;">        height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">140px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;">36</span> <span style="background-color: #f5f5f5; color: #ff0000;">        background</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> url(http://images2015.cnblogs.com/blog/754767/201606/754767-20160601000042992-1734972084.png) </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;">37</span> <span style="background-color: #f5f5f5; color: #ff0000;">        animation</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">run 1s infinite</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;">38</span> <span style="background-color: #f5f5f5; color: #ff0000;">            -webkit-animation</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">run 1s infinite</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;">39</span> <span style="background-color: #f5f5f5; color: #ff0000;">        animation-fill-mode </span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> backwards</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;">40</span> <span style="background-color: #f5f5f5; color: #ff0000;">            -webkit-animation-fill-mode </span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> backwards</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;">41</span>     <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;">42</span>     <span style="color: #0000ff;"></</span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">43</span> <span style="color: #0000ff;"></</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">44</span> <span style="color: #0000ff;"><</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">45</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">46</span> <span style="color: #0000ff;"></</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">47</span> <span style="color: #0000ff;"></</span><span style="color: #800000;">html</span><span style="color: #0000ff;">></span>

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View Code

还有另外一个实现方法，就是利用steps(),就是帧之间的阶跃动画，这个在w3c里面没有写，先贴个图

阶跃动画解析

由上图可知:
steps(1,start):动画一开始就跳到 100% 直到这一帧（不是整个周期）结束
steps(1,end):保持 0% 的样式直到这一帧（不是整个周期）结束
另外也可以直接设置 animation-timing-function:step-start/step-end
step-start效果等同于steps(1,start)，step-end效果等同于steps(1,end)

最终效果，因为录制的问题可能有点卡顿，有兴趣的同学可以直接复制代码去跑下：

完整代码：

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<span style="color: #008080;">  1</span> <span style="color: #0000ff;"><!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">  2</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">html </span><span style="color: #ff0000;">lang</span><span style="color: #0000ff;">="en"</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">  3</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">  4</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="UTF-8"</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">  5</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>css3逐帧动画<span style="color: #0000ff;"></</span><span style="color: #800000;">title</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">  6</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">  7</span> <span style="background-color: #f5f5f5; color: #800000;">        @keyframes run</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;">  8</span> <span style="background-color: #f5f5f5; color: #ff0000;">            0%{

</span><span style="color: #008080;">  9</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 10</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 11</span> <span style="background-color: #f5f5f5; color: #800000;">            8.333%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 12</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -140px 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 13</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 14</span> <span style="background-color: #f5f5f5; color: #800000;">            16.666%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 15</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -280px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 16</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 17</span> <span style="background-color: #f5f5f5; color: #800000;">            25.0%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 18</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -420px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 19</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 20</span> <span style="background-color: #f5f5f5; color: #800000;">            33.333%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 21</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -560px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 22</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 23</span> <span style="background-color: #f5f5f5; color: #800000;">            41.666%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 24</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -700px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 25</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 26</span> <span style="background-color: #f5f5f5; color: #800000;">            50.0%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 27</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -840px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 28</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 29</span> <span style="background-color: #f5f5f5; color: #800000;">            58.333%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 30</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -980px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 31</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 32</span> <span style="background-color: #f5f5f5; color: #800000;">            66.666%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 33</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1120px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 34</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 35</span> <span style="background-color: #f5f5f5; color: #800000;">            75.0%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 36</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1260px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 37</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 38</span> <span style="background-color: #f5f5f5; color: #800000;">            83.333%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 39</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1400px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 40</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 41</span> <span style="background-color: #f5f5f5; color: #800000;">            91.666%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 42</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1540px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 43</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 44</span> <span style="background-color: #f5f5f5; color: #800000;">            100%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 45</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 46</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 47</span> <span style="background-color: #f5f5f5; color: #800000;">        }

</span><span style="color: #008080;"> 48</span> <span style="background-color: #f5f5f5; color: #800000;">        @-webkit-keyframes run</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 49</span> <span style="background-color: #f5f5f5; color: #ff0000;">            0%{

</span><span style="color: #008080;"> 50</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 51</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 52</span> <span style="background-color: #f5f5f5; color: #800000;">            8.333%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 53</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -140px 0</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 54</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 55</span> <span style="background-color: #f5f5f5; color: #800000;">            16.666%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 56</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -280px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 57</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 58</span> <span style="background-color: #f5f5f5; color: #800000;">            25.0%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 59</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -420px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 60</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 61</span> <span style="background-color: #f5f5f5; color: #800000;">            33.333%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 62</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -560px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 63</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 64</span> <span style="background-color: #f5f5f5; color: #800000;">            41.666%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 65</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -700px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 66</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 67</span> <span style="background-color: #f5f5f5; color: #800000;">            50.0%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 68</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -840px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 69</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 70</span> <span style="background-color: #f5f5f5; color: #800000;">            58.333%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 71</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -980px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 72</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 73</span> <span style="background-color: #f5f5f5; color: #800000;">            66.666%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 74</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1120px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 75</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 76</span> <span style="background-color: #f5f5f5; color: #800000;">            75.0%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 77</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1260px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 78</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 79</span> <span style="background-color: #f5f5f5; color: #800000;">            83.333%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 80</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1400px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 81</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 82</span> <span style="background-color: #f5f5f5; color: #800000;">            91.666%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 83</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> -1540px 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 84</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 85</span> <span style="background-color: #f5f5f5; color: #800000;">            100%</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 86</span> <span style="background-color: #f5f5f5; color: #ff0000;">                background-position</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 0 0 </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 87</span>             <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 88</span> <span style="background-color: #f5f5f5; color: #800000;">        }

</span><span style="color: #008080;"> 89</span> <span style="background-color: #f5f5f5; color: #800000;">        div</span><span style="background-color: #f5f5f5; color: #000000;">{</span>

<span style="color: #008080;"> 90</span> <span style="background-color: #f5f5f5; color: #ff0000;">            width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">140px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 91</span> <span style="background-color: #f5f5f5; color: #ff0000;">            height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">140px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 92</span> <span style="background-color: #f5f5f5; color: #ff0000;">            background</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> url(http://images2015.cnblogs.com/blog/754767/201606/754767-20160601000042992-1734972084.png) </span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 93</span> <span style="background-color: #f5f5f5; color: #ff0000;">            animation</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">run 1s steps(1, start) infinite</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 94</span> <span style="background-color: #f5f5f5; color: #ff0000;">                -webkit-animation</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">run 1s steps(1, start) infinite</span><span style="background-color: #f5f5f5; color: #000000;">;</span>

<span style="color: #008080;"> 95</span>         <span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #008080;"> 96</span>         <span style="color: #0000ff;"></</span><span style="color: #800000;">style</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 97</span>     <span style="color: #0000ff;"></</span><span style="color: #800000;">head</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 98</span>     <span style="color: #0000ff;"><</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 99</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>

<span style="color: #008080;">100</span>     <span style="color: #0000ff;"></</span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span>

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