现在手机的占比越来越高，各种酷炫页面层出不穷，这些特效都离不开css动画。说到css动画，主流的情况也就无非这两大类：位移和形变。而我们在写一个动画特效的过程中，如何去提升它的性能呢？当然首先我们需要去了解一下基本的概念，比如浏览器渲染的工作原理等，这些我也在读了几位大牛写的相关文章后才有了一定的了解，这边我也不细说了，有兴趣的同学可以去了解一下。本次的目的简单粗暴地讲，其实就是我们应该使用什么css属性去进行动画的绘制时，能够有效的提高浏览器在渲染和绘制过程中的性能。
快速进入主题，大家先来看个demo。我分别使用了left和transform在2秒内向右平移了500px的位移。代码如下：
<style>.box-ps,.box-tf{position:absolute;top:0;left:0;width:100px;height:100px;background-color:red;}.box-ps{-webkit-animation:box-ps 2s linear;}.box-tf{-webkit-animation:box-tf 2s linear;}@-webkit-keyframes box-ps{0%{left:0;}100%{left:500px;}}@-webkit-keyframes box-tf{0%{-webkit-transform:translate(0,0);}100%{-webkit-transform:translate(500px,0);}}</style><body><div class="box-ps"></div><div class="box-tf"></div></body> 然后在chrome下得到了如下的结果，第一张为使用left的截图，第二张为使用transform的截图：
显而易见，我们在帧模式这里可以看到left比transform帧数要低，而且在渲染和绘制这边的耗时，left要远远的大于transform。看到这里，相信大家心里已经有结论了。我们再利用chrome的show paint rectangles来观察一下两者在动画过程中，渲染和绘制的区域有何差异,第一张为使用left的截图，第二张为使用transform的截图：
我们可以看到，使用left写的整个动画过程中，浏览器一直在进行绘制处理。而相对而言，使用transform时，仅仅是在动画开始和结束是进行了绘制。因此，对于动画的性能上，transform要更为出色。至于原因，这里就要引入一个触发重新布局的概念：
我们在改变一些属性时，如果是跟layout相关的属性，则会触发重新布局，导致渲染和绘制所需要的时间将会更长。因此，我们在写动画的时候因该规避这些属性：width, height, margin, padding, border, display, top, right, bottom ,left, position, float, overflow等。不会出发重新布局的属性有：transform(其中的translate, rotate, scale), color, background等。
所以，我们平时在写css动画时，应该优先使用不触发重新布局的属性，这样可以使我们所展示动画效果的更加流畅。
本文作者：li, zhijia 转载请注明来自： 携程设计委员会
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