Javascript 面向对象编程定义对象函数的方法

//A.利用传统的原始方法定义对象的方法(函数) 一

    function Programmer(name,age,position){      
		this.name = name;      
		this.age = age;      
		this.position = position;   

	   	this.displayInfo =  function(){    
			alert("[Name: "+ this.name +"]  [Age: "+this.age+"]  [position: "+this.position+"]");
		}

		this.setName = function(name){    
		   this.name = name;
		}

		this.setAge = function(age){    
			this.age = age;
		}

		this.setPosition = function(position){    
		    this.position = position;
		}

    }  

   var oBpmProgrammer = new Programmer("Kevin",24,"BPM Programmer");   
   oBpmProgrammer.displayInfo();    //[Name: Kevin] [Age: 24] [position: BPM Programmer]
   oBpmProgrammer.setName("Andy");
   oBpmProgrammer.displayInfo();    //[Name: Andy] [Age: 24] [position: BPM Programmer]


//B.利用传统的原始方法定义对象的方法(函数) 二

    function Programmer(name,age,position){      
       this.name = name;      
       this.age = age;      
       this.position = position;        
    }     


	Programmer.prototype.displayInfo =  function(){    
       alert("[Name: "+ this.name +"]  [Age: "+this.age+"]  [position: "+this.position+"]");      
	}

	Programmer.prototype.setName = function(name){    
         this.name = name;
	}

	Programmer.prototype.setAge = function(age){    
         this.age = age;
	}

	Programmer.prototype.setPosition = function(position){    
         this.position = position;
	}


  var oBpmProgrammer = new Programmer("Kevin",24,"BPM Programmer");   
  oBpmProgrammer.displayInfo();    //[Name: Kevin] [Age: 24] [position: BPM Programmer]
  oBpmProgrammer.setName("Andy");
  oBpmProgrammer.displayInfo();    //[Name: Andy] [Age: 24] [position: BPM Programmer]


//C.利用原型定义对象方法(函数)的另一种方法

  function Programmer(name,age,position){      
      this.name = name;      
      this.age = age;      
      this.position = position;        
  }     

 Programmer.prototype = {
	displayInfo : function(){    
       alert("[Name: "+ this.name +"]  [Age: "+this.age+"]  [position: "+this.position+"]");      
	},

	setName : function(name){    
         this.name = name;
	},

	setAge : function(age){    
         this.age = age;
	},

	setPosition : function(position){    
         this.position = position;
	},

	sex:"male"
 }

  var oBpmProgrammer = new Programmer("Kevin",24,"BPM Programmer");   
  oBpmProgrammer.displayInfo();    //[Name: Kevin] [Age: 24] [position: BPM Programmer]
  oBpmProgrammer.setName("Andy");
  oBpmProgrammer.displayInfo();    //[Name: Andy] [Age: 24] [position: BPM Programmer]
  alert(oBpmProgrammer.sex)        //male


//D.测试这种方法使用的继承是否有效


  function Person(name,age,position){      
      this.name = name;      
      this.age = age;      
      this.position = position;        
  }     

 Person.prototype = {
	displayInfo : function(){    
       alert("[Name: "+ this.name +"]  [Age: "+this.age+"]  [position: "+this.position+"]");      
	},

	setName : function(name){    
         this.name = name;
	},

	setAge : function(age){    
         this.age = age;
	},

	setPosition : function(position){    
         this.position = position;
	},
	sex:"male"
 }


  function Programmer(name,age,position){
		Person.call(this,name,age,position)
  }

  Programmer.prototype = new Person();   

  var oBpmProgrammer = new Programmer("Kevin",24,"BPM Programmer");   
  oBpmProgrammer.displayInfo();    //[Name: Kevin] [Age: 24] [position: BPM Programmer]
  oBpmProgrammer.setName("Andy");
  oBpmProgrammer.displayInfo();    //[Name: Andy] [Age: 24] [position: BPM Programmer]
  alert(oBpmProgrammer.sex)        //male