<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>媒介查询</title>
<style>
*{
margin:0;
padding:0;
}
#container{
width:100%;
height: 500px;
background: pink;
}
/* 小于500px*/
@media only screen and (max-width:500px ) {
/*小于500时布局的样式控制开始*/
#a,#b,#c{
float:none;
}
#a{
background: red;
width:100%;
height: 500px;
}
#b{
background: yellow;
width:100%;
height: 500px;
}
#c{
width:100%;
height: 500px;
background: blue;
}
/*小于500时布局的样式控制结束*/
}
/* 大于500px*/
@media only screen and (min-width:500px ) {
/*小于500时布局的样式控制开始*/
#a,#b,#c{
float:left;
}
#a{
background: red;
width:33.3%;
height: 500px;
}
#b{
background: yellow;
width:33.3%;
height: 500px;
}
#c{
width:33.3%;
height: 500px;
background: blue;
}
/*小于500时布局的样式控制结束*/
}
</style>
</head>
<body>
<div id="container">
<div id="a">我是第一块</div>
<div id="b">我是第二块</div>
<div id="c">我是第三块</div>
</div>
</body>
</html>
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