关于对象+原型+继承（三）

 1 function a(name,color){  
 2     this.name=name;  
 3     this.color=color;  
 4     this.geta=function() {    
 5       return(‘this is a‘); 
 6     }
 7 }
 8 a.prototype.price=-100;
 9 a.prototype.rating=3;
10 a.prototype.getb=function(){
11     return ("this is another a");
12 };

15 var tt=new a("ton","red");

 1 a;//输出a(name, color)
 2 
 3 a.prototype;//输出a { price=-100,  rating=3,  getb=function()}
 4 
 5 a.__proto__;//输出function() ，小写的f
 6 
 7 a.constructor;//输出Function(),大写的F

 8 a.constructor.prototype;//输出function()
 9 
10 a.constructor.prototype===a.__proto__;//输出true
11 
12 a.prototype.constructor===a;//输出true
13 
14 a.prototype.constructor;//输出a(name, color)

 1 tt.prototype;//输出undefined
 2 
 3 tt.__proto__;//输出a { price=-100,  rating=3,  getb=function()}
 4 
 5 tt.__proto__===a.prototype;//输出true
 6 
 7 tt.constructor;//输出a(name, color)
 8 
 9 tt.constructor.prototype;
10 //输出a { price=-100,  rating=3,  getb=function()}
11 
12 tt.prototype.constructor;//报错TypeError: tt.prototype is undefined

1 tt.constructor===a;//true
2 
3 tt.__proto__===a.prototype;//true
4 
5 a.prototype.constructor===a;//true
6 
7 a.prototype.constructor.prototype===a.prototype;//true