JavaScript原型链demo

function Person(name){

  this.name = name;

}



Person.prototype = {

  say: function(){

    alert('hi');

  },

  sayName: function(){

    alert(this.name);

  }

};



function Programmer(){

  this.say = function(){

    alert('im Programmer, my name is ' + this.name);

  }

}



Programmer.prototype = new Person('mikej');

//手动修正构造函数

Programmer.prototype.constructor = Programmer;

var p1 = new Programmer();



console.dir(Programmer.prototype.constructor);//Programmer

console.dir(p1.constructor);//Programmer

console.dir(p1);