prototype-inheritance.js

// 1. constructor Animal
function Animal(name) {
  this.name = name;
  this.speed = 0;
}

// 1.1. prototype methods
Animal.prototype.stop = function() {
  this.speed = 0;
  alert( this.name + ' stops' );
}

Animal.prototype.run = function(speed) {
  this.speed += speed;
  alert( this.name + ' runs, the speed is ' + this.speed );
};

// 2. constructor Rabbit
function Rabbit(name) {
  this.name = name;
  this.speed = 0;
}

// 2.1. inhteritance
Rabbit.prototype = Object.create(Animal.prototype);
Rabbit.prototype.constructor = Rabbit;
//Rabbit.prototype.__proto__ = Animal.prototype; not supported in IE10+

// 2.2. Mehthods Rabbit
Rabbit.prototype.jump = function() {
  this.speed++;
  alert( this.name + ' jumps, the speed is ' + this.speed );
}