flex学习之路--问题手册：as 关于this关键字的范围【未解决，求解决】

<?xml version="1.0" encoding="utf-8"?>
<mx:TitleWindow xmlns:mx="http://www.adobe.com/2006/mxml"  
				showCloseButton="true"  layout="absolute">
	<mx:Button label="fun1" click="fun1()"/>
	<mx:Script>
		<![CDATA[
			
			private function fun1():void{
				trace(this);
				fun2();
				var obj = obj.fun3();
				obj.fun4();
			}
			
			private var fun2:Function = function():void{
				trace(this);
			}
				
			private var obj:Object = {
				fun3:function():Object{
					trace(this);
					return {
						fun4:function():void{
							trace(this);
						}
					}
				}
			}
		]]>
	</mx:Script>
</mx:TitleWindow>

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