返回顶部(解决IE6固定定位)

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
 5     <title>Document</title>
 6     <style type="text/css">
 7         *{
 8             margin: 0px;
 9             padding: 0px;
10         }
11         html{
12             background: url(about:blank) fixed;
13         }
14         .back{
15             width: 57px;
16             height: 57px;
17             background: url('./back.png') no-repeat;
18             position: fixed;
19             right: 50px;
20             bottom: 50px;
21             _position: absolute;
22             _right: 50px;
23             _top:expression(document.documentElement.clientHeight-this.offsetHeight-50+document.documentElement.scrollTop);
24             cursor: pointer;
25             display: none;
26         }
27         body{
28             height: 5000px;
29             font-size: 22px;
30             font-weight:700;
31         }
32     </style>
33     <script type="text/javascript" src="./jquery.js"></script>
34     <script type="text/javascript">
35         $(function(){
36             var back = $('.back');
37             back.click(function() {
38                 var timer = setInterval(function(){
39                     $(window).scrollTop($(window).scrollTop()-50);
40                     if($(window).scrollTop() == 0){
41                         clearInterval(timer);
42                     }
43                 },2);
44             });
45 
46             $(window).scroll(function() {
47                 if($(window).scrollTop() < 100){
48                     back.hide(500);
49                 } else {
50                     back.show(500);
51                 }
52             });
53             
54         })
55     </script>
56 </head>
57 <body>
58     请往下拖动滚动条
59     <div class="back"></div>
60 </body>
61 </html>