本文共 1783 字，大约阅读时间需要 5 分钟。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | <!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 > |
原文链接：http://www.jb51.net/article/38228.htm
本文转自 小旭依然 51CTO博客，原文链接:http://blog.51cto.com/xuyran/1788311
转载地址：http://zcial.baihongyu.com/