Javascriptにおける対象継承の実現例

 
  
 
  
 
  
 
  
 
  
 
  
 
  <br>/** 
  <br>* json      
  <br>{key:value,key:value,key:value..} 
  <br>*/ 
  <br>//         
  <br>//-----1 
  <br>var r={}; 
  <br>r.name="tom"; 
  <br>r.age=18; 
  <br>//-----2 
  <br>var r={name:"tom",age:20};//json   
  <br>alert(r.age); 
  <br>//---1,2     
  <br>//-------        
  <br>//----1 
  <br>function Person(){}; 
  <br>Person.prototype.name="   "; 
  <br>Person.prototype.age=20; 
  <br>//         --2 
  <br>function Person(){}; 
  <br>Person.prototype={name:"   ", 
  <br>age:20,} 
  <br>//-----1,2    
  <br>//================================ 
  <br>/* {name:"   ", 
  <br>age:20,} 
  <br>              ，          prototype，    
  <br>          。        
  <br>*/ 
  <br>//================================ 
  <br>//         ，Person,Student 
  <br>//    Person   
  <br>function Person(){}; 
  <br>Person.prototype.name="   "; 
  <br>Person.prototype.age=20; 
  <br>var person=new Person(); 
  <br>//    Student   
  <br>function Student(){}; 
  <br>Student.prototype=person; 
  <br>Student.prototype.girlFriend="    "; 
  <br>var stu=new Student(); 
  <br>stu.laop="     "; 
  <br>alert(stu.name);//          
  <br>alert(stu.laop);//         
  <br> 
  <br>//    Teamleader    
  <br>function Teamleader(){}; 
  <br>Teamleader.prototype=new Student();//   Student 
  <br>Teamleader.prototype.teamNum=8;//Teamleader      
  <br>//        
  <br>var teamleader=new Teamleader(); 
  <br>alert(teamleader.teamNum); 
  <br>teamleader.girlFriend="      "; 
  <br>alert(teamleader.name); 
  <br>//================================= 
  <br>/*js        prototype*/ 
  <br>//================================= 
  <br>