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HomeWeb Front-endH5 TutorialJS动画比CSS3动画性能谁更好?

之前一直以为css3的才是最厉害的,但是最近做HTML5页面发现在微信上的效果不是太好。
最近发现的github上比较火的velocity.js,作者宣称要做DOM动画方面的领导者,完全颠覆了我的认识啊。

相关链接:
CSS vs. JS Animation: Which is Faster?

回复内容:

稍微做过一点点 Web App,目前深陷在 Android Webview 里不能自拔,来谈一点看法。

1. 在现代PC 浏览器上,CSS3 Animation 和 Transition 好写好用,流畅丝滑,而且动画过程0 GC。当然js 控制DOM动画如果控制好了,不要频繁reflow,动画也流畅。

2. 在 iOS Safari 上,CSS3 动画和js动画都容易搞流畅,只要别reflow。

3. 在 iOS Webview 上,不能用jit,js性能下降严重,如果CSS3动画能解决还是别用js。某个版本iOS之后这个限制解除了好像,不太了解。

4. 低版本 Android 用的是很老的 Webkit,没有硬件加速,CSS3支持不完全,2d Canvas有bug,性能比chrome 差老远了,如果动画复杂又大块,DOM树复杂,还用了box-shadow 之类很耗性能的样式,很难做流畅。

这种情况请考虑 Chrome on Android,或者crosswalk。

5. Android 4.4 以后,系统自带chromium,体验能做到与iOS safari不相上下。

====

另外多提一句GC。

GC 你听过吧?如果不用CSS3 Animation 和 Transition,就要用 requestAnimationFrame() 。在动画的过程中会不断调用js,消耗内存,一段时间之后触发GC,如果GC时间超出frame budget,动画会卡顿。

如果非要用js动画,那么也请考虑使用无reflow 的 transform属性,加上 translateZ(0) 强制指定硬件加速。 JS 动画也是通过更改 CSS 实现的。

而且从设计的角度来说,CSS 本身就是设计用来表现样式,JS 控制逻辑。JS 动画是 CSS3 出现之前的曲线救国。

个人觉得,简单的动画还是用 CSS 做,特别复杂的再用 JS。

codepen 上面的趋势是去 JS 化,动画一律用 CSS 实现。借助 LESS 等预编译语言可以做出很复杂的动画。

性能的话,短期手机浏览器可能对 CSS3 支持不太好,但长期一定是会优于 JS 的。 其实这个。。。。。看引擎的。。。。
chrome上css3明显流畅过js,IE11上的js动画如丝般顺滑。。。。 动画的性能的关键,不在于js执行的效率,而在于dom结构。所以css原生动画,与js动画并不会相差太大。
优化动画性能,就要减轻dom,使用合理的定位方式,等等。 这种对比应该还是要来个例子。
这是前几天我翻译一篇文章时看到的对比Building Great Mobile Menus (为你的网站创建移动菜单)
对了,我的翻译只是为了自己总结学习,有精简很多。。建议看原文=-=
不是涉及复杂的计算,css明显快,但是涉及到复杂的计算,比如点是不确定的,你还是要用js。

其实这种对比个人感觉没什么意义(可能是我水),在项目中, 大多数情况下-0-你都要用js来计算。 js+canvas(html5)+水平>css3>js+dom 就说一点,JS动画比CSS3动画有控制,且没有兼容性问题 从原理上来说的话
CSS == iOS
JS == Android

(以20马赫快速逃跑中 个人项目体会:
在没有RAF时,css方式流畅度占优。
有RAF后两者相当。


js方式要求开发人员对js足够熟悉,以避免引入其他问题 其实这点差别在实际大部分使用情况下并木有卵区别……
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