简单瀑布流封装

function createLi(){
		var oLi=document.createElement(‘li‘);
		oLi.style.height=parseInt(50+Math.random()*400)+‘px‘;
		oLi.style.background=‘rgb(‘+rnd(0,255)+‘,‘+rnd(0,255)+‘,‘+rnd(0,255)+‘)‘;
		return oLi;
	};

	function rnd(n,m){   
		return parseInt(Math.random()*(m-n+1)+n);
	};

	window.onload=function(){
		oDiv=document.getElementById(‘div1‘);
		var aUl=oDiv.children;

		function create(){

			for(var i=0; i<20; i++){
				var oLi=createLi();
				var arr=[];

				for(var j=0; j<aUl.length; j++){
					arr[j]=aUl[j];
				};

				arr.sort(function(oUl1,oUl2){
					return oUl1.offsetHeight-oUl2.offsetHeight;
				});

				arr[0].appendChild(oLi);
			}
		};

		create();

		window.onscroll=function(){
			var winH=document.documentElement.clientHeight;
			var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;
			var scrollHeight=document.body.scrollHeight;

			if(scrollTop>=scrollHeight-winH-200){
				create();
			}
		}
	}