this & Constructors

gistfile1.js

var Car = function(colour) {
  this.colour = colour;
};
var redCar = new Car("Red");
var yellowCar = new Car("Yellow");
Car.prototype.getColour = function(){ 
  return this.colour;
};

console.log(redCar.getColour());
console.log(redCar.getColour.apply(yellowCar));