利用@media screen实现网页布局的自适应

@media screen and (min-width:1200px){
    #page{ width: 1100px; }
　　 #content,.div1{width: 730px;}
    #secondary{width:310px}
}

@media screen and (min-width: 960px) and (max-width: 1199px) {
    #page{ width: 960px; }
    #content,.div1{width: 650px;}
    #secondary{width:250px}
　　select{max-width:200px}
}
@media screen and (min-width: 768px) and (max-width: 959px) {
    #page{ width: 900px; }
　　#content,.div1{width: 620px;}
　　#secondary{width:220px}
　　select{max-width:180px}
}
@media only screen and (min-width: 480px) and (max-width: 767px){
    #page{ width: 450px; }
　　#content,.div1{width: 420px;position: relative; }
　　#secondary{display:none}
　　#access{width: 450px; }
　　#access a {padding-right:5px}
　　#access a img{display:none}
　　#rss{display:none}
　　#branding #s{display:none}
}
@media only screen and (max-width: 479px) {
    #page{ width: 300px; }#content,.div1{width: 300px;}#secondary{display:none}#access{width: 330px;} #access a {padding-right:10px;padding-left:10px}#access a img{display:none}#rss{display:none}#branding #s{display:none}#access ul ul a{width:100px}
}