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 Samples.Cat=function() 
  {
     Samples.Pet.call(this);
   }
   Samples.Cat.prototype =new Samples.Pet();  //²âÊÔ´úÂë
   Samples.Pet.registerClass('Samples.Pet');
   Samples.Cat.registerClass('Samples.Cat');
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  var cc=new Samples.Cat();
  cc.set_name("°×è");
  cc.speak(); 
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  Samples.Cat.prototype.speak=function (){alert ('meeeewooooo')};
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function Pet()
      {
         this._name;
         this._age;        
      }
      Pet.prototype={
         speak:function (){
            alert (this._name+"Meeeeooow");      }
     }
Cat=function (){
      Cat.initializeBase(this );  //´¦Àí¼Ì³Ð²¢µ÷ÓûùÀ๹Ô캯Êý
Samples.Cat.registerClass('Samples.Cat',Samples.Pet)
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Samples.Cat.prototype={
       speak:function (){
         alert ("Meeeeooow");
       }
  } 
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3.4.2Ïò»ùÀà´«µÝ²ÎÊý
Samples.Pet= function (name ,age)
    {
      this._name=name ;
      this._age=age;
}
…..
Samples.Cat=function (name,age)
   {
      Samples.Cat.initializeBase(this,[name,age]);
   }
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