<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>toTop</title> <style type="text/css"> *{ margin:0; padding: 0; } html{ height: 100%; } .toTopBtn{ position: fixed; bottom: 100px; right: 100px; background: #333; color: #fff; padding: 5px 10px; cursor: pointer; display: none; } </style> </head> <body> <p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p><p>kkk</p> <script type="text/javascript" src="http://vscss.com/dm/jquery.js"></script> <script type="text/javascript"> $(function(){ var toTop = $("<span class='toTopBtn'>返回顶部</span>"); $('body').append(toTop); $(window).scroll(function(event) { if($(window).scrollTop()>100){ $('.toTopBtn').fadeIn(); }else{ $('.toTopBtn').fadeOut(); } }); $('.toTopBtn').click(function(){ $('html,body').animate({ scrollTop:0 },200); //return false; }); }); </script> </body> </html>