@media screen and (max-1660px)
@media screen and (min- 960px) and (max- 1199px)
@media only screen and (min- 480px) and (max- 767px)
<link rel="stylesheet" media="(min- 641px)" href="css/maintain.css" />
<link rel="stylesheet" media="screen and (min-1px) and (max-width:600px)" href="phone.css" />
<link rel="stylesheet" media="screen and (条件) and (条件)" href="pc.css" />
判断手机还是pc
http://www.jb51.net/article/48939.htm