HTML源码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>响应式布局</title>
<link rel="stylesheet" href="css-commonFlag.css">
</head>
<body>
<div class="heading"></div>
<div class="container">
<div class="left"></div>
<div class="main"></div>
<div class="right"></div>
</div>
<div class="footing"></div>
</body>
</html>
css源码：
* {
margin: 0px;
padding: 0px;
}
.heading,
.container,
.footing {
margin: 10px auto;
}
.heading {
height: 100px;
background-color: chocolate;
}
.left,
.main,
.right {
background-color: cyan;
}
.footing {
height: 100px;
background-color: gray;
}
@media only screen and (min-width: 960px) {
.heading,
.container,
.footing {
width: 960px;
}
.left,
.main,
.right {
float: left;
height: 500px;
}
.left,
.right {
width: 200px;
}
.main {
margin: 0px 5px;
width: 550px;
}
.container {
height: 500px;
}
}
@media only screen and (min-width: 600px) and (max-width: 960px) {
.heading,
.container,
.footing {
width: 600px;
}
.left,
.main {
float: left;
height: 400px;
}
.left {
width: 160px;
}
.right {
display: none;
}
.main {
margin-left: 5px;
width: 435px;
}
.container {
height: 400px;
}
}
@media only screen and (max-width: 600px) {
.heading,
.container,
.footing {
width: 400px;
}
.left,
.right {
width: 400px;
height: 100px;
}
.main {
margin-top: 10px;
width: 400px;
height: 200px;
}
.right {
margin-top: 10px;
}
.container {
height: 420px;
}
}
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