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                            浮動布局主要采用 float?和 clear?兩個屬性來構建。

1.固定布局
~~~html
<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="utf-8">
    <title>site title</title>

	<style type="text/css">
		body {
			width: 960px;
			margin: 0 auto;
			font-size:30px;
			background-color: red;
		} 
		header {
			height: 120px;
			background-color: blue;
		} 
		aside {
			width: 200px;
			height: 500px; 
			float: left;
			background-color: pink;
		} 
		section {
			width: 760px; 
			height: 500px; 
			float: right;
			background-color: yellow;
		} 
		footer { 
			height: 120px; 
			background-color: orange;
			clear: both;
		}
	</style>

</head>

<body>
    <header> header </header>
    <aside> aside </aside>
    <section> section </section>
    <footer> footer </footer>
</body>

</html>
~~~
![](https://img.kancloud.cn/a1/f7/a1f7351f677c9085ded0c98b9a94320a_897x535.png)
**2、流體布局**
流體布局只要更改 body?元素的限定長度為 auto?或 100%。然后左右兩列分別設置 20%?和 80%即可。
~~~
body { 
    width: auto;
}
aside {
    width: 20%;
}
section { 
    width: 80%;
}?
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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