css布局之浮动、定位、负边距三者之间的灵活结合利用

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945996501 2014-05-12 18:22:59 博主文章分类：Css

单列定宽单列自适应布局：

<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>单列定宽单列自适应布局</title>
<style type="text/css">
* {margin:0;padding:0;}
.cont, .side {float:left;}
.cont {width:100%;}
.main {margin-right:200px;background:#DDDDDD;}
.side {margin-left:-200px;width:200px;background:#F7F7F7;}
</style>
</head>
<body>
<div class="cont">
<div class="main">main</div>
</div>
<div class="side">side</div>
</body>
</html>

左右定宽中间自适应布局：

<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>左右定宽中间自适应布局</title>
<style type="text/css">
* {margin:0;padding:0;}
.cont, .side, .sub-main {float:left;}
.cont {width:100%;}
.main {margin-right:200px;margin-left:300px;background:#DDDDDD;}
.side {margin-left:-200px;width:200px;background:#F7F7F7;}
.sub-main {margin-left:-100%;width:300px;background:#F7F7F7;}
</style>
</head>
<body>
<div class="cont">
<div class="main">main</div>
</div>
<div class="side">side</div>
<div class="sub-main">sub-main</div>
</body>
</html>

两列等高自适应布局：

<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>两列等高自适应布局</title>
<style type="text/css">
* {margin:0;padding:0;}
.layout {overflow:hidden;}
.cont, .side {float:left;padding-bottom:9999px;margin-bottom:-9999px;}
.cont {width:100%;}
.main {margin-right:200px;background:#DDDDDD;}
.side {margin-left:-200px;width:200px;background:#F7F7F7;}
</style>
</head>
<body>
<div class="layout">
<div class="cont">
<div class="main">
main
<br/><br/><br/><br/><br/><br/><br/>
</div>
</div>
<div class="side">side</div>
</div>
</body>
</html>

利用浮动的包裹性和相对定位百分比数据值特性,传说称之为“相对浮动”

.unknow_width_center1 {position:relative; left:50%;float:left;}
.unknow_width_center1 li {position:relative; right:50%; z-index:2;float:left}
<ul class="unknow_width_center1">
<li><a href="#">1</a></li>
<li><a href="#">2</a></li>
 <li><a href="#">3</a></li>
 <li><a href="#">4</a></li>
<li><a href="#">5</a></li>
 <li><a href="#">6</a></li>
</ul>