instanceof.js

function Person(){}
Person.prototype.name = "hanjung";
Person.prototype.age = 27;
Person.prototype.getName = function(){
  return this.name;
}
var inst1 = new Person();
console.log(inst1.name);

Person.prototype = {
  name: "doojung",
  age: 28
};

var inst2 = new Person();
console.log(inst2.name);

console.log(inst1 instanceof Person); // ?
console.log(inst2 instanceof Person); // ?

false/true