1.<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
viewport:视图窗口，视口内容宽度 initial-scale:初始时比例，不进行缩放，user-scalable=no 禁止用户触屏缩放屏幕
2.避免使用绝对单位如（px）,应该使用相对单位（%，em,rem），使用流式布局，使用响应式图片。
3.Media Queries 应用
①<link rel="stylesheet" type="text/css" href="style1.css" media="screen and (min- 500px)">//当屏幕的宽度大于等于500px的时候，应用style1.css
②同理
@media screen and (max- 600px) { /*当屏幕尺寸小于600px时，应用下面的CSS样式*/
.class {
background: #ddd;
}
}
以下是demo
一个三栏布局的，在不同的尺寸下，变为两栏，再变为一栏~
<!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;
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;
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- 1024px){
.content{
1000px;
margin: auto
}
}
@media only screen and (min- 400px) and (max- 1024px){
.rightBox{
0;
}
.leftBox{ 30%}
.middleBox{ 65%}
}
@media only screen and (max- 400px){
.leftBox, .rightBox, .middleBox{
98%;
height: 200px;
}
}
</style>
</head>
<body>
<div class="content">
<div class="leftBox"></div>
<div class="middleBox"></div>
<div class="rightBox"></div>
</div>
</body>
</html>
参考文章：http://www.swordair.com/blog/2010/08/431/
http://webdesignerwall.com/tutorials/css3-media-queries
http://www.ruanyifeng.com/blog/2012/05/responsive_web_design.html
http://www.cnblogs.com/mofish/archive/2012/05/23/2515218.html