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2.ʹÓöÔÏóð³äʵÏּ̳Ð
      function ClassA(sColor){
         this.color=sColor;
         this.showColor=function (){
            alert(this.color);
         };
      }
      function ClassB(sColor,sName){
         this.newMethod=ClassA;   //´Ë´¦½«ÀàClassAµÄ¹¹Ô캯ÊýClassA()¿´×öÒ»¸öÆÕͨº¯Êý½øÐÐÒýÓ㬼´»ñµÃÁ˳¬ÀàµÄ¹¹ÔìÆ÷
         this.newMethod(sColor);   //´Ë´¦µ÷ÓÃnewMethod()·½·¨¹¹ÔìÒ»¸öClassB¶ÔÏó
         delete this.newMethod;   //ɾ³ý¶ÔClassA()·½·¨µÄÒýÓã¬ÒÔºó²»ÄÜÔÙµ÷ÓÃËü£¬ÒòΪ¶ÔÏóÉú³Éºó²»¿ÉÄÜÔÙµ÷Óù¹Ô캯Êý
     
         this.name=sName;   //×ÓÀàµÄгÉÔ±±äÁ¿ºÍ·½·¨
         this.showName=function (){
            alert(this.name);
         };
      }
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      function ClassB(sColor,sName){
         ClassA.call(this,sColor);   //¼´¶ÔClassBµÄʵÀýµ÷ÓÃClassA()¹¹Ô캯Êý£¬²¢½«sColor×÷Ϊ²ÎÊý´«Èë
        
         this.name=sName;
    


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