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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" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/> <title>回到顶部 - 豪情</title> <style type="text/css"> *{ margin:0; padding:0;} body{font:12px/1.125 Arial,Helvetica,sans-serif;background:#fff;} a:focus,input,textarea{outline-style:none;} a{color:#0a8cd2;text-decoration:none;} a:hover{text-decoration:underline;} .none{display:none} .demo{ height:2000px;} .gotop{ 18px;line-height:1.2;padding:7px 0px 7px 2px;background-color:#000;color:#fff;font-size:12px;text-align:center;position:fixed;_position:absolute;right:0px;bottom:100px;_bottom:"auto";cursor:pointer;opacity:0.6;filter:Alpha(opacity=60);border-radius:5px 0 0 5px; display:none;} .gotop:hover{ text-decoration:none;opacity:0.7;filter:Alpha(opacity=70);} </style> </head> <body> <div class="demo"></div> <script type="text/javascript"> (function(){ function viewSize(){ var doc = document, de = doc.documentElement; return { 'width': (window.innerWidth || (de && de.clientWidth) || doc.body.clientWidth), 'height': (window.innerHeight || (de && de.clientHeight) || doc.body.clientHeight) }; } function getScrollTop(){ return document.documentElement.scrollTop || document.body.scrollTop; } var btn = null, timer = 0; function apendScroll(){ btn = document.createElement('a'); btn.href = 'javascript:void(0)'; btn.className = 'gotop'; btn.innerHTML = '回到顶部'; document.body.appendChild(btn); } apendScroll(); function ie6Top(){ if(!window.XMLHttpRequest){ btn.style.top = getScrollTop() + viewSize().height - 200 + 'px'; } } window.onscroll = function(){ btn.style.display = getScrollTop() > 0 ? 'block' : 'none'; ie6Top(); } btn.onclick = function(){ timer = setInterval(function(){ var scrollTop = getScrollTop(); var iSpeed = Math.floor(- scrollTop / 8); if(scrollTop == 0){ clearInterval(timer); } ie6Top(); document.documentElement.scrollTop = document.body.scrollTop = scrollTop + iSpeed; }, 30); } }()); </script> </body> </html>

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原文地址：https://www.cnblogs.com/jikey/p/2980351.html