prototype、constructor、__proto__

 1 function Person() {

 2         }

 3 

 4         Person.prototype.name = "Nicholas";

 5         Person.prototype.age = 29;

 6         Person.prototype.job = "Software Engineer";

 7         Person.prototype.sayName = function () {

 8             console.log(this.name);

 9         };

 

         var person1 = new Person();

         person1.sayName();

 

         var person2 = new Person();

         person2.sayName();

 

         console.log(person1.sayName == person2.sayName);//函数相等

         console.log(Person.constructor);

         console.log(Person.prototype.constructor);

         console.log(person1.__proto__);

         console.log(person2.__proto__);