jquery 回到顶部

来源：互联网发布：乌合之众读后感知乎编辑：程序博客网时间：2024/04/29 06:48

css

.backToTop {    display: none;    width: 18px;    line-height: 1.2;    padding: 5px 0;    background-color: #000;    color: #fff;    font-size: 12px;    text-align: center;    position: fixed;    _position: absolute;    right: 10px;    bottom: 100px;    _bottom: "auto";    cursor: pointer;    opacity: .6;    filter: Alpha(opacity=60);}

 <script>$(function(){var $backToTopTxt = "返回顶部", $backToTopEle = $('<div class="backToTop"></div>').appendTo($("body"))        .text($backToTopTxt).attr("title", $backToTopTxt).click(function() {            $("html, body").animate({ scrollTop: 0 }, 120);    }), $backToTopFun = function() {        var st = $(document).scrollTop(), winh = $(window).height();        (st > 0)? $backToTopEle.show(): $backToTopEle.hide();            //IE6下的定位        if (!window.XMLHttpRequest) {            $backToTopEle.css("top", st + winh - 166);            }    };    $(window).bind("scroll", $backToTopFun);});</script>