javascript prototype chain demonstration

prototype.js

var Creature = function() {};
Creature.prototype = {
  f1 : function() {
    console.log("f1 in creature");
  }
};

var Animal = function() {};
Animal.prototype = new Creature;
Animal.prototype.constructor = Animal;
Animal.prototype.f2 = function() {
  console.log("f2 in animal");
};

var Dog = function() {};
Dog.prototype = new Animal;
Dog.prototype.constructor = Dog;
Dog.prototype.f3 = function() {
  console.log("f3 in dog");
};

dog = new Dog;
dog.f1();
dog.f2();
dog.f3();

Creature.prototype.f11 = function() {
  console.log("f11 in creature");
};

dog.f11();