js页面滑到底部触发事件

function getScrollTop(){
	　　var scrollTop = 0, bodyScrollTop = 0, documentScrollTop = 0;
	　　if(document.body){
	　　　　bodyScrollTop = document.body.scrollTop;
	　　}
	　　if(document.documentElement){
	　　　　documentScrollTop = document.documentElement.scrollTop;
	　　}
	　　scrollTop = (bodyScrollTop - documentScrollTop > 0) ? bodyScrollTop : documentScrollTop;
	　　return scrollTop;
	}
	//文档的总高度
	function getScrollHeight(){
	　　var scrollHeight = 0, bodyScrollHeight = 0, documentScrollHeight = 0;
	　　if(document.body){
	　　　　bodyScrollHeight = document.body.scrollHeight;
	　　}
	　　if(document.documentElement){
	　　　　documentScrollHeight = document.documentElement.scrollHeight;
	　　}
	　　scrollHeight = (bodyScrollHeight - documentScrollHeight > 0) ? bodyScrollHeight : documentScrollHeight;
	　　return scrollHeight;
	}
	//浏览器视口的高度
	function getWindowHeight(){
	　　var windowHeight = 0;
	　　if(document.compatMode == "CSS1Compat"){
	　　　　windowHeight = document.documentElement.clientHeight;
	　　}else{
	　　　　windowHeight = document.body.clientHeight;
	　　}
	　　return windowHeight;
	}
	

	window.onscroll = function(){
	　　if(getScrollTop() + getWindowHeight() == getScrollHeight()){
	　　　moreReconmend();
	//	console.log("getScrollTop:"+getScrollTop()+"**getWindowHeight:"+getWindowHeight()+"**getScrollHeight:"+getScrollHeight())
	　　}
	};function getScrollTop(){
	　　var scrollTop = 0,