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@@ -0,0 +1,49 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <link rel="stylesheet" media="screen and (min-width:500px)" href="./css/a.css">
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+ <style>
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+ .box{
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+ width: 200px;
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+ height: 200px;
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+ background-color: red;
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+ }
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+ /* @media screen and (min-width:500px){
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+ .box{
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+ width: 400px;
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+ height: 400px;
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+ }
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+ } */
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+ /* @media screen and (max-width:500px) {
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+ .box{
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+ background-color: blue;
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+ }
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+ } */
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+
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+ /* @media screen and (min-width:500px) and (max-width:800px){
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+ .box{
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+ background-color: blue;
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+ }
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+ } */
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+
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+ /* 监听屏幕为横屏时 */
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+ /* @media screen and (orientation: landscape){
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+ .box{
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+ background-color: blue;
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+ }
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+ } */
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+ /* 监听屏幕为竖屏 */
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+ /* @media screen and (orientation: portrait){
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+ .box{
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+ background-color: blue;
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+ }
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+ } */
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+ </style>
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+</head>
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+<body>
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+ <div class="box"></div>
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+</body>
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+</html>
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