var Vehicle = Backbone.Model.extend({
description: function () {
return 'I have ' + this.get('wheels') + ' wheels';
}
});
var Bicycle = Vehicle.extend({
defaults: {
wheels: 2
}
});
var Car = Vehicle.extend({
defaults: {
wheels: 4
}
});
var bike = new Bicycle();
bike.description() // I have 2 wheels;
var car = new Car();
car.description() // I have 4 wheels;;