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function classA(sColor){ 
       this.color=sColor; 
       this.sayColor=function(){ 
         alert(this.color); 
       } 

function classC(sColor,sName){ 
    classA.call(this,sColor); 
    this.name=sName; 
    this.sayName=function(){ 
      alert(this.name); 
    } 

var obj1=new classC("red","jack"); 
obj1.sayColor(); 
obj1.sayName();
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function classD(sColor,sName){ 
   classA.apply(this,new Array(sColor)); 
   this.name=sName; 
   this.sayName=function(){ 
     alert(this.name); 
   } 
 } 
  
 var obj2=new classD("blue","sherry"); 
obj2.sayColor(); 
obj2.sayName();
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  function classA(sName){ 
    this.name=sName; 
  } 
   
  classA.prototype.sayName=function(){ 
    alert(this.name); 
  } 
   
  function classB(sName,sHeight){ 
     classA.call(this,sName) 
     this.height=sHeight; 
  } 
   
  classB.prototype=new classA(); 
   
  classB.prototype.sayHeight=function(){ 
     alert(this.height); 
  } 
   
  var obj3=new classA("jack"); 
   
  obj3.sayName(); 
   
  var obj4=new classB("shrry",27);&nbs


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