响应式布局

详细可查看原文 

Meta 标签

<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">

Media Queries 媒体查询

//手机
@media screen and (max-width: 980px) {

}
//平板
@media screen and (max-width: 1024px) {

}
//桌面
@media screen and (max-width: 1200px) {

}

设备分辨率