CODE:
import index.com.main.Level2D;
import index.com.events.Level2DEvent;

var l2:Level2D = new Level2D(this);
l2.addEventListener(Level2DEvent.LEVEL_RESET,levelResetFun);
l2.isTime = true;

function levelResetFun(e:Level2DEvent){
trace(l2.getDisplay("x"));//獲取當前所有對象的x屬性
trace(l2.getDisplay({y:0,x:0}));//獲取當前所有對象，xy屬性都等于0的對象
/**
*輸出：
*137,0,229
*[object MovieClip]
*/
}

mc1.addEventListener(MouseEvent.MOUSE_DOWN,funa);
mc2.addEventListener(MouseEvent.MOUSE_DOWN,funa);
mc3.addEventListener(MouseEvent.MOUSE_DOWN,funa);

mc1.addEventListener(MouseEvent.MOUSE_UP,funb);
mc2.addEventListener(MouseEvent.MOUSE_UP,funb);
mc3.addEventListener(MouseEvent.MOUSE_UP,funb);

function funa(e:MouseEvent):void{
e.target.startDrag();
}
function funb(e:MouseEvent):void{
e.target.stopDrag();
}Level2D源代碼：

CODE:
package index.com.truss{

import flash.events.EventDispatcher;
import flash.events.IEventDispatcher;
import flash.events.Event;
import flash.display.DisplayObjectContainer;
import flash.display.DisplayObject;

import index.com.events.Level2DEvent;

public class Level2D implements IEventDispatcher{

private var dispatcher:EventDispatcher;
private var _range:DisplayObjectContainer;

public function Level2D(range_:DisplayObjectContainer){
dispatcher = new EventDispatcher(this);
_range = range_;
}

//重排
public function reset():Array{
var tmpAr:Array = getDisplay();
var getYAr:Array = getDisplay("y");
var addYAr:Array = getYAr.concat().sort(16);

if(getYAr.toString() != addYAr.toString()){
inOrder(tmpAr.sortOn("y",16));

//發布層級改變事件
dispatcher.dispatchEvent(new Level2DEvent(Level2DEvent.LEVEL_RESET));
}

getYAr = addYAr = null;
return tmpAr;
}

//返回當前范圍所有對象
public function getDisplay(arg:Object = null):Array{
var i:int;
var tmpAr:Array = new Array;
var num:int = _range.numChildren;
if(arg == null){
for(i = 0; i < num; i ) tmpAr.push(_range.getChildAt(i));
}else if(arg is String){
for(i = 0; i < num; i ) tmpAr.push(_range.getChildAt(i)[arg]);
}else{
for(i = 0; i < num; i ){
var dis:DisplayObject = _range.getChildAt(i);
var isEnter:Boolean = true;
for(var index:String in arg){
if(dis[index] != arg[index]){
isEnter = false;
break;
}
}
if(isEnter) tmpAr.push(dis);
dis = null;
}
}
return tmpAr;
}

//以特定方式遍歷該范圍的顯示對象
public function forEach(fun:Function,arg:Object = null):void{
var tmpAr:Array = getDisplay(arg);
for(var i:int = 0; i < tmpAr.length; i ){
var str:String = fun(tmpAr[i],i);
if(str == "true") return;
}
tmpAr = null;
}

//給定一個排序數組，進行排序
protected function inOrder(tmpAr:Array):void{
for(var i:int = 0; i < tmpAr.length; i ) _range.addChild(tmpAr[i] as DisplayObject);
}

//設置實時重排
public function set isTime(_isTime:Boolean):void{
if(_isTime) _range.addEventListener(Event.ENTER_FRAME,resetFun);
else _range.removeEventListener(Event.ENTER_FRAME,resetFun);
}

//實時重排
private function resetFun(e:Event):void{
reset();
}

//返回操作區域
public function get range():DisplayObjectContainer{
return _range;
}

//偵聽
public function addEventListener(type:String,listener:Function,useCapture:Boolean = false,priority:int = 0,useWeakReference:Boolean = false):void{
dispatcher.addEventListener(type,listener,useCapture,priority,useWeakReference);
}

//調度
public function dispatchEvent(event:Event):Boolean{
return dispatcher.dispatchEvent(event);
}

//是否含有偵聽
public function hasEventListener(type:String):Boolean{
return dispatcher.hasEventListener(type);
}

//移除偵聽
public function removeEventListener(type:String,listener:Function,useCapture:Boolean = false):void{
dispatcher.removeEventListener(type,listener,useCapture);
}

//檢查偵聽
public function willTrigger(type:String):Boolean{
return dispatcher.willTrigger(type);
}
}
}Level2DEvent類源代碼：

CODE:
package index.com.events{

import flash.events.Event;

public class Level2DEvent extends Event{

public static const LEVEL_RESET:String = "levelReset";

public function Level2DEvent(type:String){
super(type);
}
}
}