这在很多网站都常见，比如说美丽说，还有本博，css实现div悬浮不动效果很简单，效果图就如本站所示，实现css代码如下：
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>CSS固定定位</title>
<style type="text/css">
{
padding:0;
margin:0;
}
div{
width:100%;
line-height:30px;
background: red;
border:1px solid #F90;
position:fixed;
top:0px;
left:0px;
}
</style>
<!--[if lte IE 6]>
<style type="text/css">
html {
height:100%;
overflow:hidden;
}
body {
height:100%;
overflow:auto;
}
div{
position:absolute;
}
</style>
<![endif]-->
</head>
<body>
<div id="fixedLayer">固定不动</div>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
<p>php教程</p>
</body>
</html>要考虑到IE6不兼容问题即可！
![[Web front-end] Permulaan pantas Node.js](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
