Jquery回到顶部效果

时间：2022-11-03 21:38:53
<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

    <style type = "text/css">

        div{ position:relative;}

        div #sp{ position:absolute; bottom:; right:;}

        #sp{ position:fixed; top:%; left:82.5%; cursor:pointer;}

    </style>

    <script type = "text/javascript" src = "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() > ) {

                        $("#sp").fadeIn();

                    }

                    else {

                        $("#sp").fadeOut();

                    }

                });

            });

            $("#sp img").click(function () {

                $("body,html").animate({ scrollTop:  }, , 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":  }); //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 = "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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