JQuery 回到顶部效果

图片,CSS/HTML/JS代码都在,可以直接用了.

CSS代码

    <style type="text/css">
        #gs_feedback_gotop
        {
            _display: none;
        }
        #gs_feedback_gotop .side_fixed
        {
            position: fixed;
            right: 20px;
            bottom: 40px;
            z-index: 250;
        }
        #gs_feedback_gotop .to_top
        {
            position: relative;
            display: block;
             35px;
            height: 0;
            margin-left: -8px;
            margin-bottom: 2px;
            padding-top: 35px;
            background: url(/image/go-top.png) no-repeat;
            overflow: hidden;
            cursor: pointer;
            z-index: 2;
            visibility: hidden;
        }
        #gs_feedback_gotop .to_top:hover
        {
            background-position: -36px 0;
        }
        #gs_feedback_gotop .c_fq, #gs_feedback_gotop .c_qs, #gs_feedback_gotop .c_os
        {
            display: block;
             35px;
            height: 0;
            margin-left: -8px;
            padding-top: 35px;
            overflow: hidden;
            cursor: pointer;
            z-index: 2;
            margin-bottom: 2px;
            position: relative;
            background: url(../img/global/go-top.png) no-repeat;
        }
        #gs_feedback_gotop .c_fq
        {
            background-position: 0 -38px;
        }
        #gs_feedback_gotop .c_fq:hover
        {
            background-position: -36px -38px;
        }
        #gs_feedback_gotop .c_qs
        {
            background-position: 0 -76px;
        }
        #gs_feedback_gotop .c_qs:hover
        {
            background-position: -36px -76px;
        }
</style>

HTML代码

    <div id="gs_feedback_gotop">
        <div class="side_fixed">
            <a class="to_top" title="回到顶端" href="#top" id="gotop2" style="visibility: visible;
                display: block;"> </a>
        </div>
</div>

JavaScript代码

        $(document).ready(function () {
            $(window).scroll(function () {

                if ($(document).scrollTop() >= 200) {
                    $('#gotop2').css('visibility', 'visible');
                } else {
                    $('#gotop2').css('visibility', 'hidden');
                }
            });