@media screen
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html >
<head>
<meta charset="gb2312">
<title> New Document </title>
<meta name="Keywords" content="">
<meta name="Description" content="">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
</head>
<style>
p{display:none}
body{background-color:red}
@media screen and (max-width:320px){#ip4{display:block;}body{background-color:blue}}
</style>
<body>
<p id="ip4">苹果4</p>
<p id="ip5">苹果5</p>
<p id="ip6">苹果6</p>
<p id="ip6+">苹果6+</p>
<script>
document.documentElement.style.height = window.innerHeight + 'px';
alert(document.documentElement.clientWidth);
alert(document.documentElement.style.height);
</script>
</body>
</html>
*****************************
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>css3-media-queries-demo</title>
<style>
body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, form, fieldset, input, textarea, p, blockquote, th, td {
padding: 0;
margin: 0;
}
.content{
zoom:1;
}
.content:after{
content: ".";
display: block;
height: 0;
clear: both;
visibility: hidden;
}
.leftBox, .rightBox{
float: left;
width: 20%;
height: 500px;
margin: 5px;
background: #ffccf7;
display: inline;
-webkit-transition: width 1s ease;
-moz-transition: width 1s ease;
-o-transition: width 1s ease;
-ms-transition: width 2s ease;
transition: width 1s ease;
}
.middleBox{
float: left;
width: 50%;
height: 800px;
margin: 5px;
background: #b1fffc;
display: inline;
-webkit-transition: width 1s ease;
-moz-transition: width 1s ease;
-o-transition: width 1s ease;
-ms-transition: width 1s ease;
transition: width 1s ease;
}
.rightBox{
background: #fffab1;
}
@media only screen and (min-width: 1024px){
.content{
width: 1000px;
margin: auto
}
}
@media only screen and (min-width: 400px) and (max-width: 1024px){
.rightBox{
width: 0;
}
.leftBox{ width: 30%}
.middleBox{ width: 65%}
}
@media only screen and (max-width: 400px){
.leftBox, .rightBox, .middleBox{
width: 98%;
height: 200px;
}
}
</style>
</head>
<body>
<div class="content">
<div class="leftBox"></div>
<div class="middleBox"></div>
<div class="rightBox"></div>
</div>
</body>
</html>
*********************************
/* 竖屏 */
@media screen and (orientation:portrait) and (max-width: 720px) {对应样式}
/* 横屏 */
@media screen and (orientation:landscape){对应样式}
