jQuery实现拉动页面固定顶部显示且自动消失（火狐）

<！DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>回到顶部：哭泣的小丑</title> <script src="http://demo.jb51.net/jslib/jquery/jquery-1.6.2.min.js"></script><style> html, body, div, span, applet, object, iframe,h1, h2, h3, h4, h5, h6, p, blockquote, pre,a, abbr, acronym, address, big, cite, code,del, dfn, em, img, ins, kbd, q, s, samp,small, strike, strong, sub, sup, tt, var,b, u, i, center,dl, dt, dd, ol, ul, li,fieldset, form, label, legend, input,table, caption, tbody, tfoot, thead, tr, th, td,article, aside, canvas, details, embed,figure, figcaption, footer, header, hgroup,menu, nav, output, ruby, section, summary,time, mark, audio, video {margin: 0;padding: 0;border: 0;font-size: 100%;} article, aside, details, figcaption, figure,footer, header, hgroup, menu, nav, section {display: block;float:left;}select, input, button,button img, label {vertical-align: middle;}body {font:normal 12px/1.5 "Microsoft Yahei","微软雅黑",Tahoma,Arial,Helvetica,STHeiti; webkit-font-smoothing:antialiased;-moz-font-smoothing: subpixel-antialiased; color:#666;}ol, ul {list-style: none;}blockquote, q {quotes: none;}blockquote:before, blockquote:after,q:before, q:after {content: "";content: none;}table {border-collapse: collapse;border-spacing: 0;}em {font-style: normal}select, input, button, button img, label {vertical-align:middle;}input {font-family:"Microsoft Yahei","微软雅黑";webkit-font-smoothing:antialiased;-moz-font-smoothing: subpixel-antialiased}input, input:focus, button, button:focus, select,textarea, textarea:focus {outline:none; -moz-outline:none; -webkit-outline:none; }input:focus { outline:none; -moz-outline:none; -webkit-outline:none; }textarea {resize:none;}a {color:#666; text-decoration:none;} a:hover {text-decoration:underline;}a:focus {outline:none; -moz-outline:none;-webkit-outline:none;}body {min-width: 960px;} </style> <style> body{background:#e7e7e7;} .clearfix:before, .clearfix:after, .container_24:before, .container_24:after { content: "."; display: block; overflow: hidden; visibility: hidden; font-size: 0; line-height: 0; width: 0; height: 0;} .clearfix:after, .container_24:after { clear: both; } .Xc_main{width:750px;margin:0 auto;position:relative;} .Xc_left{float:left;} .Xc_left h1{font-size:24px;padding-top:25px;} .Xc_right{float:right;width:600px;} .Xc_right .Xc_list{margin:10px 0 10px 0;} .Xc_list_top,.Xc_list_main{background:#fff;padding:10px;border:1px solid #ccc;} .Xc_list_top{margin-bottom:10px;} .Xc_gg{width:90px;height:90px;border:1px solid #ccc;background:#fff;text-align:center;} .Xc_bottom{height:650px;background:#fff;padding:10px;border:1px solid #ccc;position:relative;} </style></head> <script> $（function （） { $（".Xc_list_top"）.css（"width",$（".Xc_list_main"）.width（））; var resetRightPanelPostion = function （） { var msie6 = $.browser.msie && $.browser.version == "6.0" && $.browser.version < 7; if （$.browser.safari） { bodyelem = $（"body"）; } else { bodyelem = $（"html,body"）; } var bodyTop = bodyelem.scrollTop（）; var top = $（".Xc_left"）.offset（）.top; //var t = $（"#public_footer"）.offset（）.top; var t = $（"#footerDestinationBox"）.offset（）.top; //var bottom = $（"#footerDestinationBox"）.offset（）.top; for（var i = 0 ; i < $（".Xc_list .Xc_list_top"）.length ; i++）{ if （bodyTop >= top && （（bodyTop + $（".Xc_left"）.outerHeight（）） < t）） { if （！msie6） { if （bodyTop + $（".Xc_gg"）.outerHeight（） >= t） { $（".Xc_gg"）.removeClass（"fixed"）.css（{ "position": "absolute", "top": t - $（".Xc_gg"）.outerHeight（） + "px" }）; } else { $（".Xc_gg"）.css（{ "position": "fixed", "top": 0 }）; } } } else { if （！msie6） { $（".Xc_gg"）.css（{ "position": "static" }）; } } if（bodyTop>$（".Xc_list"）.eq（i）.offset（）.top）{ $（".Xc_list_top"）.eq（i）.css（{position:"absolute",top:top-168}）; } if（bodyTop>$（".Xc_list"）.eq（i）.offset（）.top）{ $（".Xc_list_top"）.eq（i）.css（{position:"fixed",top:0}）; } if（bodyTop<=$（".Xc_list"）.eq（i）.offset（）.top）{ $（".Xc_list_top"）.eq（i）.css（{position:"static",top:0}）; } } }; window.onload = function （） { if （$（".Xc_gg"）.length） { resetRightPanelPostion（）; $（window）.scroll（function （） { resetRightPanelPostion（）; }）; } } }） </script> <body> <h1>小丑</h1> Q群:<em style="color:#0069D6;">150508281</em>top 1 top 2 top 3 top 4 top 5 top 6by 脚本之家 @哭泣的小丑</body> </html>

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