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>absolute属性</title>
<style type="text/css">
body {
margin: 20px;
font-family: Arial;
font-size: 12px;
} #father {
background-color: #a0c8ff;
border: 1px dashed #000000;
padding: 15px;
position: relative;
} #father div {
background-color: #fff0ac;
border: 1px dashed #000000;
padding: 10px;
} #block2 {
position: absolute;
top: 0px;
right: 0px;
}
</style>
</head> <body>
<div id="father">
<div>Box-1</div>
<div id="block2">Box-2</div>
<div>Box-3</div>
</div>
</body> </html>
说明
relative是相对于浏览器定位的，absolute是相对于relative定位的。
它们都要结合top、right、left、bottom属性来使用。
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>absolute属性</title>
<style type="text/css">
body {
margin: 20px;
font-family: Arial;
font-size: 12px;
} #father {
background-color: #a0c8ff;
border: 1px dashed #000000;
padding: 15px;
position: relative;
top:20px; /*相对于浏览器*/
left:10px;
} #father div {
background-color: #fff0ac;
border: 1px dashed #000000;
padding: 10px;
} #block1 {
position: absolute;
top: 0px;
right: 0px;
} #father2 {
background-color: #a0c8ff;
border: 1px dashed #000000;
padding: 15px;
position: relative;
top:10px; /*相对于浏览器，不过基于现有的位置。*/
} #father2 div {
background-color: #fff0ac;
border: 1px dashed #000000;
padding: 10px;
} #block2 {
position: absolute;
top: 0px;
right: 0px;
}
</style>
</head> <body>
<div id="father">
<div>Box-1</div>
<div id="block1">Box-2</div>
<div>Box-3</div>
</div> <div id="father2">
<div>Box-1</div>
<div id="block2">Box-2</div>
<div>Box-3</div>
</div>
</body> </html>
说明
absolute永远是基于父relative元素定位。relative基于现有的位置，基于浏览器定位。