1 $(document).ready(function(){ 2        var winH = $(window).height(); //页面可视区域高度 3      $(window).scroll(function () { 4         var pageH = $(document.body).height(); //页面高度5         var scrollT = $(window).scrollTop(); //滚动条top 6         var aa = (pageH-winH-scrollT)/winH; //滚动条距离最下边的距离7 })8 })