怎么没效果
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<link type="text/css" href="link.css" rel="stylesheet" media="only screen and (max-width:480px)" />
<style>
@media screen and (min-width:480px) {
body {
background:blue;
}
}
</style>
</head>
<body>
</body>
</html>
