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 var animal = function(){  //Õâ¾ÍÊÇconstructor function ÁË 
   this.name = 'pipi';    
   this.age = 10;      
   this.height = 0;      
}      
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 var a1 =  new animal ();   
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var a1 = { name:'pipi' ,age:10,height:0 }  
  
//»òÕß  
var a1 = new Object();  
a1.name='pipi';  
a1.age = 10;  
a1.height = 0; 
 
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var cat = function(){    
this.play = function(){     
 alert('cat play')    
 }    
 }    
 cat .prototype = new animal ();    
 //prototype ÊôÐÔÖ¸ÏòÒ»¸ö¶ÔÏó 
var c1 = new cat();
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