jQuery下的返回顶部功能的实现实例页面

180it 2019-09-24 PM 41℃ 0条

jQuery下的返回顶部功能的实现实例页面
CSS代码:

.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);

}

JS代码:

(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);
$(function() { $backToTopFun(); });

})();

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