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Jquery回到顶部效果

<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title></title>    <style type = "text/css">        #sp{ position:fixed; top:70%; left:82.5%; cursor:pointer;}    </style>    <script type = "text/javascript" src = http://www.mamicode.com/"JueryPractice/jquery-1.7.2.min.js"></script>    <script type ="text/javascript">        $(document).ready(function () {            $("#sp").hide();            $(function () {                $(window).scroll(function () { //移动浏览器的滚动条时触发                    if ($(window).scrollTop() > 100) {                        $("#sp").fadeIn(1000);                    }                    else {                        $("#sp").fadeOut(1000);                    }                });            });            $("#sp img").click(function () {                $("body,html").animate({ scrollTop: 0 }, 1500, false);            });            //匹配id为sp选择器紧邻的第一个选择器            $("#sp + p").click(function () {                $("#sp + p").animate({ "height": 300 }); //改变元素的高度            });            $("#chui").click(function () {                alert($(window).scrollTop()); //获取滚动条距离浏览器顶端的垂直高度            });            $("#shui").click(function () {                alert($(window).scrollLeft());            });        });    </script></head><body>    <form id="form1" runat="server">    <div>    <p id = "sp"><span></span><img src = http://www.mamicode.com/"images/2011082113443606.gif.jpg" alt = "无法显示" /></p>    <p style = " position:absolute; top:2000px; cursor:pointer; background-color:Green">顶部</p>    </div>    </form></body></html>
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Jquery回到顶部效果