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public class A
{
¡¡¡¡public var vo:B
}
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public static function registerClass():void
  {
¡¡¡¡//°Ñ×ÓÀà×¢²á
   PackUtil.registerClass(B);
  }
//½ÓÏÂÀ´¾ÍÊÇ¿Ë¡£º
¡¡¡¡var cloneA:A=clone(A);
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//****************¿Ë¡µÄʵÏÖ·½·¨***********************//
//¿Ë¡һ¸övo¶ÔÏó
  public  static function clone(o:Object):Object
  {
   var qClassName:String = getQualifiedClassName(o);
            var objectType:Class = getDefinitionByName(qClassName) as Class;
            registerClassAlias(qClassName, objectType);
            var copier : ByteArray = new ByteArray();
            copier.writeObject(o);
            copier.position = 0;
            return copier.readObject();
  }
  
  //Ïòamf×¢²áÀ࣬ÒԱ㷴תµÄʱºòÄÜÕÒµ½¸ÃÀà
  public  static function registerClass(classObj:Object):void
  {
   ¡¡¡¡var qClassName:String = getQualifiedClassName(classObj);
            var objectType:Class = getDefinitionByName(qClassName) as Class;
            registerClassAlias(qClassName, objectType);
  }