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);})();