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返回顶部按钮功能的实现

<!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>

 

返回顶部按钮功能的实现