1.
/*@media Rule*/
@media all and (max-width : 1024px){...}
2.
/*@imput Rule*/
@imput url(styles.css) all and (max-width : 1024px){...}
3.
<link rel = "stylesheet" href = "styles.css" media = " all and (max-width : 1024px)">
原文：http://www.cnblogs.com/mmykdbc/p/6204506.html