媒体查询语法：
1.内联写法：and之后必须有空格
@media screen and (min-width:960px //判断浏览器大小条件){
body{background：red} //常规的样式
}
2.外联写法：当满足屏幕满足条件的时候连接href后的css文件
<link='stylesheet' media='screen and (min-width:960)' href='xx.css'/>
<link='stylesheet' media='screen and (min-width:960) and (max-width:1960)' href='xx.css'/>
媒体查询根据不同屏幕显示不同界面有两种方式：
1.在不同的媒体查询判定的大括号后写不同的样式
2.写两个相同的HTML内部的内容，通过媒体查询判断界面后，显示一个，隐藏另一个
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
.big{ /*1*/
width: 1000px;
outline: 1px solid #000;
margin: auto;
color: #fff;
}
.big>div{
width: 50%;
height: 200px;
outline: 1px dashed yellow;
background: orange;
float: left;
}
.big2{ /*2*/
width: 600px;
outline: 1px solid #000;
margin: auto;
color: #fff;
display: none;
}
.big2>div{
width: 100%;
height: 200px;
outline: 1px dashed yellow;
background: lightpink;
clear: both;
}
@media screen and (max-width: 640px) {
.big{display: none}
.big2{display: block}
}
</style>
</head>
<body>
<div class="big">
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
<div>5</div>
<div>6</div>
</div> <div class="big2">
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
<div>5</div>
<div>6</div>
</div>
</body>
</html>