移动端字体单位该使用px还是rem?

对于只需要适配少部分手机设备，分辨率对页面影响不大的，使用px即可，

对于需要适配各种移动设备，使用rem，例如只需要适配iPhone和iPad等分辨率差别比较挺大的设备。

rem配置参考，适合视觉稿宽度为640px的：

<meta content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no" name="viewport">

html{font-size:10px}

@media screen and (min-width:321px) and (max-width:375px){html{font-size:11px}}

@media screen and (min-width:376px) and (max-width:414px){html{font-size:12px}}

@media screen and (min-width:415px) and (max-width:639px){html{font-size:15px}}

@media screen and (min-width:640px) and (max-width:719px){html{font-size:20px}}

@media screen and (min-width:720px) and (max-width:749px){html{font-size:22.5px}}

@media screen and (min-width:750px) and (max-width:799px){html{font-size:23.5px}}

@media screen and (min-width:800px){html{font-size:25px}}

来自博客园--下雨天的太阳（http://www.cnblogs.com/doomjx/）--