jquery back to top 页面底部的返回顶部按钮

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<!doctype html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Back to top</title>

    <script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.js"></script>

    <style type="text/css">

        .back-to-top {

            position: fixed;

            bottom: 50px;

            right: 150px;

            background:url(btn_top.png) no-repeat; 

            display: none;

            height:49px;

            width:49px;

            cursor: pointer;

        }

        body{

            height:1500px;

        }

    </style>

</head>

<body>

    <div id="back-to-top"  class="back-to-top "></div>

</body>

</html>

<script type="text/javascript">

    $(document).ready(function () {

        $(window).scroll(function () {

            if ($(this).scrollTop() > 0) {

                $('#back-to-top').fadeIn();

            } else {

                $('#back-to-top').fadeOut();

            }

        });

        // scroll body to 0px on click

        $('#back-to-top').click(function () {

            $('body,html').animate({

                scrollTop: 0

            }, 500);

            return false;

        });

    });

</script>