以下是reset.js具体内容，是从淘宝网站拔下来的。把它存为js文件引入html里，它的默认尺寸是iphone4的分辨率也就是320*480，美工给你的图不管多少尺寸用ps量图后像素值（px）除以40转化为rem。比如div宽为40px，除以40为1rem，这个div的宽就写成1rem，整个网页就是计算，最后做出来的网页不用在考虑适配，因为它会自动缩放适配任何手机，比起百分比做出的网站兼容性要好得多，而且能实现动功能也能强大的许多.
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