日期:2014-05-16 浏览次数:20437 次
<!DOCTYPE HTML>
<html>
<head>
<meta charset="gb2312" />
<title></title>
<style>
body {
height:2000px;
}
div {
position:absolute; right:40px; top:40px;
width:90%; height:30px;
background:#ddd;
}
</style>
</head>
<body>
<div id="test">滚动试试</div>
<script>
function toolbar(el){
el = typeof el == 'string' ? document.getElementById(el) : el;
var elTop = el.offsetTop;
var sTop = 0;
window.onscroll = function(){
sTop = document.body.scrollTop
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