SOURCE

function Person (){
}
Person.prototype.name = "Nicolas";
Person.prototype.age = 24;
Person.prototype.job = "engineer";
Person.prototype.sayName = function(){
  console.log(this.name);
}
var person1 = new Person();
person1.sayName()
var person2 = new Person();
console.log(person1.sayName == person2.sayName)