详解定位与定位应用
代码
代码
代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>无标题页</title>
<style type="text/css">
#box_1, #box_2 {position:relative; width:300px; height:100px; margin:10px; background:#ddd;}
#box_1 {z-index:100;}
#box_2 {z-index:1;}
#a, #b {position:absolute; width:100px; height:300px; }
#a {background:#c00; }
#b {background:#0c0; left:50px;}
</style>
</head>
<body>
<div id="box_1">
<div id="a">这是第一个块</div>
</div>
<div id="box_2">
<div id="b">这是第二个块</div>
</div>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>无标题页</title>
<style type="text/css">
#box_1, #box_2 {position:relative; width:300px; height:100px; margin:10px; background:#ddd;}
#box_1 {z-index:100;}
#box_2 {z-index:1;}
#a, #b {position:absolute; width:100px; height:300px; }
#a {background:#c00; }
#b {background:#0c0; left:50px;}
</style>
</head>
<body>
<div id="box_1">
<div id="a">这是第一个块</div>
</div>
<div id="box_2">
<div id="b">这是第二个块</div>
</div>
</body>
</html>
通过设置父DIV的z-index 堂兄弟之间的顺序不能被重组,何不把父辈的等级做一次重组呢
设置同样的position:relative/absolute;同级标签之间的等级是无法用z-index超越的。
代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<!-- www.div-css.com 网站标准化 2007-4-16 -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
li {height:100px; margin:0 5px 0 0; float:left; width:100px;background:#000;}
li:hover {position:relative;}
li span { display:none;}
li:hover span {display:block;width:200px; height:200px; background:#c00; z-index:100;position:absolute; top:0; left:100px;}
</style>
</head>
<bodyz>
<ul>
<li><span>第一块</span></li>
<li><span>第二块</span></li>
<li><span>第三块</span></li>
<li><span>第四块</span></li>
<li><span>第五块</span></li>
</ul>
<script type="text/javascript">
</script>
</body>
</html>
<html>
<!-- www.div-css.com 网站标准化 2007-4-16 -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
li {height:100px; margin:0 5px 0 0; float:left; width:100px;background:#000;}
li:hover {position:relative;}
li span { display:none;}
li:hover span {display:block;width:200px; height:200px; background:#c00; z-index:100;position:absolute; top:0; left:100px;}
</style>
</head>
<bodyz>
<ul>
<li><span>第一块</span></li>
<li><span>第二块</span></li>
<li><span>第三块</span></li>
<li><span>第四块</span></li>
<li><span>第五块</span></li>
</ul>
<script type="text/javascript">
</script>
</body>
</html>
父类 relative 子类 absolute 子原点是父(TOP LEFT)的左上角(TOP LEFT)父块的content为基准
这个快设置了absolute而没有父块设置relative 原点是body
