<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style type="text/css">
*{
padding: 0px;margin: 0px;}
body
{
transition: 0.3s;
}
@media all and (max-width: 900px)
{
body
{
background: red;
}
}
@media all and (min-width: 900px) and (max-width: 1200px)
{
body
{
background: yellow;
}
}
@media all and (min-width: 1200px)
{
body
{
background: black;
}
}
</style>
</head>
<body>
</body>
</html>
数字>=1200变成黑色.
900<=数字 <=1200.变成黄色.
数字<=900就红色.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style type="text/css">
*{
padding: 0px;margin: 0px;}
body
{
transition: 0.3s;
}
@media all and (orientation:landscape)
{
body
{
background: black;
}
div
{
position: absolute;
width: 100px;
height: 100px;
left: 20px;top: 50px;
}
}
@media all and (orientation:portrait)
{
body
{
background: yellow;
}
div
{
position: absolute;width: 50px;height: 150px;
background: green;
left: 50px;top: 20px;
}
}
</style>
</head>
<body>
</body>
</html>
解释：横屏黑色.竖屏(例如手机端)黄色.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="1.css" media="(orientation:landscape)">
<link rel="stylesheet" type="text/css" href="2.css" media="(orientation:portrait)">
<style type="text/css">
*{
padding: 0px;margin: 0px;}
</style>
</head>
<body>
<div></div>
</body>
</html>
1.css
body{background:black;}
2.css
body{background:red;}
横屏黑色,竖屏红色.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style type="text/css">
*{
margin: 0;padding: 0;}
div{
transition:0.9s;}
@media all and (max-width: 600px){
div{
width: 200px;height: 200px;background: red};
}
@media all and (min-width: 600px) and (max-width: 800px){
div{
width: 300px;height: 300px;background: green};
}
@media all and (min-width: 800px){
div{
width: 400px;height: 400px;background: yellow};
}
</style>
</head>
<body>
<div id='div1'></div>
<script type="text/javascript">
div1.οnclick=function()
{
if(innerWidth<600)
{
alert(1);
}
else if(innerWidth>600&&innerWidth<800)
{
alert(2);
}
else
{
alert(3);
}
}
</script>
</body>
</html>
在小于600的情况下,红色。.点击弹出1
在600以上800以下的情况下,green。.点击弹出2
在800以上的话,是黄色.点击弹出3