@media screen and (max-width:767px){
}
@media screen and (max-width:480px){
}
@media screen and ( min-width:480px) and (max-width:767px){
}
@media screen and ( min-width:768px) and (max-width:959px){
}
demandware responsive支持
原文：http://my.oschina.net/u/151844/blog/348050
