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div_tiao.html
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<!DOCTYPE html >
<head>
<meta charset="UTF-8">
<title>div相对定位、绝对定位的嵌套效果对比</title>
<style type="text/css">
body { margin: 30px; font-size: 9pt; }
.a, .b, .c, .d, .e { width: 100px; height: 100px; margin: 5 auto; color: #fff; background: #000; }
.aa, .bb, .cc, .dd, .ee {width: 10px; height: 10px; overflow: hidden; background: #F90; }
.b, .d, .e { position: relative; }
.cc, .dd, .ee { position: absolute; }
li
{
text-align:center;
display:inline;
float:left;
list-style:none;
}
</style>
</head>
<body>
<form id="form1">
<div>
<div class="a">
<div class="aa">
</div>
A:均不设置postion，一般嵌套关系
</div>
<div class="b">
<div class="bb">
</div>
B:仅外div设置relative，一般嵌套关系
</div>
<div class="c">
<div class="cc">
</div>
C:仅内div设置absolute，文档中为嵌套关系，页面中内div浮起[非float]，相对于页面定位，与外div无关。
</div>
<div class="d" style="background: #ff0000">
<div class="dd">
</div>
D:外div设置relative，内div设置absolute，内div浮起来并相对于外div定位
</div>
<div class="d" style="background: #ff0000">
<div class="dd" style="position: relative">
</div>
D:外div设置relative，内div设置relative，内div浮起来并相对于外div定位
</div>
<div class="e">
<div class="ee" style="left: -10px;">
</div>
E:这个是说明边界问题。-10 != 反向10px间距
</div>
</div>
</form>
<br/><br/><br/><br/><br/><br/>
<div style="position:relative; width:1000px; height:800px; background-color:#000; margin:0 auto;">
<div></div>
<div style="position:absolute; background-color:#333; height:45px; width:900px;">
<ul>
<li>呵呵</li>
<li>哈哈</li>
</ul>
</div>
</div>
</body>
</html>