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<!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>弹性返回顶部JS代码</title> <script type="text/javascript"> function goTopEx() { var obj = document.getElementById("goTopBtn"); function getScrollTop() { return document.documentElement.scrollTop + document.body.scrollTop; } function setScrollTop(value) { if (document.documentElement.scrollTop) { document.documentElement.scrollTop = value; } else { document.body.scrollTop = value; } } window.onscroll = function() { getScrollTop() > 0 ? obj.style.display = "": obj.style.display = "none"; } obj.onclick = function() { var goTop = setInterval(scrollMove, 10); function scrollMove() { setScrollTop(getScrollTop() / 1.1); if (getScrollTop() < 1) clearInterval(goTop); } } } </script> <style> BODY { HEIGHT: 3600px; } #goTopBtn { POSITION: fixed; TEXT-ALIGN: center; LINE-HEIGHT: 30px; WIDTH: 30px; BOTTOM: 35px; HEIGHT: 33px; FONT-SIZE: 12px; CURSOR: pointer; RIGHT: 0px; _position: absolute; _right: auto } </style> </head> <body style="text-align:center"> <div style="display: none" id="goTopBtn"><img border=0 src="/${res}/img/go_to_top.png"></div> <script type=text/javascript>goTopEx();</script> <br /><br /><br /><br /><br /><br /><br /> <p></p> <p><p>超出首屏范围，即会出现TOP按钮，否则自动隐藏。<br /> </p></p> <p></p> </body> </html>
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