1.获得某个实例对象的类名：getQualifiedClassName (实例名字符串表达式);

stage.addEventListener(MouseEvent.MOUSE_OVER, mouseOverHandle); 

function mouseOverHandle(e:Event):void { 

trace("over"); 

//   返回instance**之类的         

trace(e.target.name); 

//返回元件名    

trace(getQualifiedClassName(e.target)); 

} 

2.获得某个实例对象的类：constructor

dynamic class A {}; 

trace(A.prototype.constructor);// [class A] 

trace(A.prototype.constructor == A);// true 

var myA:A = new A(); 

trace(myA.constructor == A);// true 

3.根据类名获得类：getDefinitionByName(类名);

package { 

import flash.display.DisplayObject; 

import flash.display.Sprite; 

import flash.utils.getDefinitionByName; 

 

public class GetDefinitionByNameExample extends Sprite { 

private var bgColor:uint = 0xFFCC00; 

private var size:uint = 80; 

 

public function GetDefinitionByNameExample() { 

var ClassReference:Class = getDefinitionByName("flash.display.Sprite") as Class; 

var instance:Object = new ClassReference(); 

instance.graphics.beginFill(bgColor); 

instance.graphics.drawRect(0, 0, size, size); 

instance.graphics.endFill(); 

addChild(DisplayObject(instance)); 

} 

} 

} 

4.用得到的类实例化对象：一般中间要用一个无类型变量传递类，进行实例化；如:

var i = 0; 

var c:* = getDefinitionByName(getQualifiedClassName("MyClass" + i)); 

var myClass:*=new c(); 

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