js实现帧动画
License: MIT License
帧动画就是在连续的关键帧中分解动画动作，也就是在时间轴上的每帧上逐帧绘制不同的内容，使其连续播放成动画。常见的帧动画方式有GIF，CSS3 animation和js。使用GIF和CSS3 animation的不足是不能灵活地控制动画的暂停和播放(比如点击暂停)，也不能灵活地捕捉到动画完成的事件，另外在动画扩展性上js更好。
用一个img标签去承载图片，定时改变img的src属性，这样显然不好。因为请求了多张图，影响性能。
把所有动画关键帧绘制在一张图片里，把图片作为元素的background-image，定时改变元素的background-position(雪碧图)。对于只是位移的动画，可以通过js直接改变元素的left或者top值
本项目主要使用第二种方式
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