$(window).scroll(function(){
var scrollTop = $(this).scrollTop();
var scrollHeight = $(document).height();
var windowHeight = $(this).height();
if(scrollTop + windowHeight == scrollHeight){
alert("已经到最底部了！");
}
});
滚动条滑到底部，加载更多
原文：http://www.cnblogs.com/xkcp008/p/4484850.html
