<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>随下拉前进的顶部进度条</title>
<script type="text/javascript" src="jquery-easyui-1.5/jquery.min.js"></script>
<style type="text/css">
*{margin:0;}
.top-progress{position: fixed;top: 0;height: 2px;width: 100%;z-index: 999}
.bar{height: 2px;background: #ec4657;width:0 }
.high{height:5680px; }
</style>
</head>
<body>
<div class="top-progress">
<div class="bar"></div>
</div>
<div class="high"></div>
<script type="text/javascript">
$(function(){
$(window).scroll(function () {
var bodyWidth=$('body').width();
var scrollTop=$(window).scrollTop();
var docHeight=$(document).height()
var winHeight=$(window).height()
$('.bar').width(bodyWidth*scrollTop/(docHeight-winHeight));
})
})
</script>
</body>
</html>