SOURCE

/* 格子排序 */
var metro = {};
metro.init=function(wrap){
	metro.gen={w:130,h:110};
	metro.wrap = wrap;
	metro.sizeArray= []; //格子,[1,2]就表示1X2的大格子
	metro.preset();
	metro.putData(wrap);
};

metro.preset = function(){
	metro.nameSpace= {};
	metro.maxY = -1;
	metro.basePos = {x:0, y:0};
	metro.memory = {flag:Infinity, x: Infinity, y:Infinity};
	metro.row = document.documentElement.offsetWidth / metro.gen.w >> 0;  
	metro.wrap.style.width = metro.row * metro.gen.w + "px";
};

metro.resort=function(){
	metro.preset();
	metro.mbox = $class("MBox");
	metro.sort(metro.sizeArray);
};

metro.putData = function(list){
	(function setBig(){  //大格子初始化设置
	 	var bigBox = $class("bigBox",list);
	   	if(bigBox.length==0) return false;
		var i = 0, nx, ny, bigBoxCont;
		while(i < bigBox.length){
			bigBoxCont =  $class("innerBox",bigBox[i]);
			nx = (bigBoxCont[0].offsetWidth / metro.gen.w) >> 0; //bigBox横向占的块数
			ny = (bigBoxCont[0].offsetHeight / metro.gen.h) >> 0;
			bigBox[i].style.width = nx*metro.gen.w - 10 + 'px' ;
			bigBox[i].style.height = ny*metro.gen.h - 10 + 'px' ;
			i++;
		}
	})();

	metro.mbox = $class("MBox",list);
	var i = 0 , nx, ny, tempSizeArray = [];
	while( i < this.mbox.length){
		if( $class("bigBox",this.mbox[i]).length > 0 ){
			nx = Math.ceil(this.mbox[i].offsetWidth / this.gen.w);
			nx = (nx > this.row) ? this.row : nx; //bigBox宽度尺寸过大
			ny = Math.ceil(this.mbox[i].offsetHeight / this.gen.h);
			tempSizeArray.push([nx,ny]);
		}else{
			tempSizeArray.push([1,1]);
		}
		i++;
	}
	 
	this.sizeArray = this.sizeArray.concat(tempSizeArray);
	metro.sort(tempSizeArray);
}


metro.sort = function(size){
	var x = metro.basePos.x, 
		y = metro.basePos.y,
		memory = metro.memory, 
		name;
		 
	for(var n=0; n < size.length ; n++){
		if(memory.flag == 0){
			x = memory.x;
			y = memory.y;
		}
		memory.flag --;
		if(x > metro.row-1){ //换行
			x = 0;
			y ++;
		}
		name = x+'_'+y;  //对象属性名（反映占领的格子）
		if(name in this.nameSpace) {  //判断属性名是否存在
			n--;
			x++;
			memory.flag < Infinity && memory.flag++;
			continue; 
		}
		if(size[n][0] * size[n][1] == 1){  //普通格子
			metro.nameSpace[name]=[x,y];  //项值（反映坐标值）
			setPos(x,y,n);
			x++;
		}
		else{  //大格子
			if(beOver(x,y,size[n])) {
				if(memory.y > y){
					memory.y = y;
					memory.x = x;
				}
				if(memory.y < Infinity) memory.flag = 1;
				n--;
				x++;
				continue; 
			}
			metro.nameSpace[name] = [x,y];
			setPos(x,y,n);
			hold(x,y,size[n]);
			x += size[n][0];
		}
		if(memory.flag == -1) memory = {flag:Infinity ,x: Infinity, y:Infinity};
		metro.maxY = Math.max(metro.maxY, y + size[n][1]);
	}
	metro.basePos = {"x":x,"y":y} 
	metro.memory = memory;
	metro.wrap.style.height= metro.gen.h * metro.maxY +'px';

	function beOver(x,y,item){  //判断是否会重叠
		var name;
		if(x + item[0] > metro.row) return true; //超出显示范围
		for(var k=1; k<item[1]; k++){
			name=x+'_'+(y-0+k);
			if(name in metro.nameSpace) return true; //左侧一列有无重叠
		}
		for(k=1; k<item[0]; k++){
			name=(x-0+k)+'_'+y;
			if(name in metro.nameSpace) return true; //上侧一行有无重叠
		}
		return false;
	};
	function hold(x,y,item){  //大格子多占的位置
		for(var t=0; t < item[0]; t++) {
			for(var k=0; k < item[1]; k++){
				name = (x+t)+'_'+(y+k);
				if(t==0 && k==0)   continue; 
				metro.nameSpace[name] = 0;   //多占的格子无坐标值
			}
		}
	};
	function setPos(x,y,n){
		var left = metro.gen.w * x,
			top = metro.gen.h * y;
		metro.mbox[n].style.cssText += "position:absolute;left:"+ left +"px;top:" + top + "px;";
	}
};

//随机数据
var myMetro = $id("myMetro"),
	
	colorList = ['f4b300','78ba00','2673ec','ae113d','632f00','b01e00','4e0038','c1004f','7200ac','2d004e','006ac1','001e4e','008287','004d60','004a00','00c13f','15992a','ff981d','e56c19','b81b1b','ff1d77','b81b6c','aa40ff','691bb8','1faeff','1b58b8','56c5ff','569ce3','00d8cc','00aaaa','91d100','b81b6c','e1b700','d39d09','ff76bc','e064b7','00a4a4','ff7d23','4cafb5','044d91','832772','d15a44','de971b','017802','6e2ea0'],
	color = colorList[0];

function createTestData(n){
	var spanWrap = document.createElement("span"),
		content = "";		
	for(i = 0; i < n; i++) {
		color = colorList[(colorList.length * Math.random())>>0];
		if(!(Math.random()*3 >> 0)){ //输出大模块测试数据。宽高在一个范围内都是随意的，未做其他限制
			height = Math.floor(Math.random()*150 + 200);
			width = Math.floor(Math.random()*150 + 200);
			content += '<div class="MBox" style="background:#'+color+'"><div class="bigBox" ><a href="http://www.klmai.cn" target="_blank" style="width:' + width +'px;height:' + height +'px;top:'+(-height%110)/2+'px;left:'+(-width%130)/2+'px;" class="widgetBox innerBox"></a></div></div>';
		}else{ //输出普通模块数据
			content += '<div class="MBox" style="background:#'+color+'"><a href="http://www.klmai.cn" target="_blank" class="widgetBox" ></a></div>';
		}
	};
	spanWrap.innerHTML = content;
	myMetro.appendChild(spanWrap);
	return spanWrap;
}

window.onload = function(){
	createTestData(35);
	metro.init(myMetro);
};
window.onresize = function(){
	metro.resort(myMetro);
};
window.onscroll=function(){
	var scrollTop = document.body.scrollTop || document.documentElement.scrollTop,
		windowHeight = document.documentElement.clientHeight,
		documentHeight = document.body.offsetHeight;
	if(windowHeight + scrollTop > documentHeight - 50){
		metro.putData(createTestData(15));
	}
}

<script type="text/javascript" src="http://sandbox.runjs.cn/uploads/rs/415/smtftt2d/extend.js"></script>

<a class="reload" href="javascript:;" onclick="myMetro.innerHTML='';createTestData(35);metro.init(myMetro);">刷新</a>
<div id="myMetro" class="myMetro"></div>

body{background:#000;}
.myMetro{position:relative;overflow:hidden;zoom:1;margin:0 auto;}
.MBox{float:left;vertical-align:middle;}
.widgetBox{position:relative;display:block;overflow:hidden;width:120px;height:100px;}
.reload{color:#fff;font-size:12px;text-decoration:none;}