返回顶部

(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);

    })

var right = ($(window).width()-900)/2;

$backToTopEle.css({

"right":right

});

$(window).resize(function(){

var right = ($(window).width()-900)/2;

$backToTopEle.css({

"right":right

});

});

$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);

})();