[рони]

Maine,

function Animal(name) {
    this.name = name
}
Animal.prototype.getName =  function() {
        return this.name;
    }

function Dog(name) {
  this.name = name
  }

Dog.prototype = Animal.prototype;
Dog.prototype.bark = function () {
        return ('Dog ' + this.name + ' is barking');
    }
var dog = new Dog('Balto');

alert(dog.getName());
alert(dog.bark());