помогите разобратся
<script>
function Car( options ) {
// some defaults
this.doors = options.doors || 4;
this.state = options.state || "brand new";
this.color = options.color || "silver";
}
// A constructor for defining new trucks
function Truck( options){
this.state = options.state || "used";
this.wheelSize = options.wheelSize || "large";
this.color = options.color || "blue";
}
// FactoryExample.js
// Define a skeleton vehicle factory
function VehicleFactory() {}
// Define the prototypes and utilities for this factory
// Our default vehicleClass is Car
VehicleFactory.prototype.vehicleClass = Car;
// Our Factory method for creating new Vehicle instances
VehicleFactory.prototype.createVehicle = function ( options ) {
if( options.vehicleType === "car" ){
this.vehicleClass = Car;
}else{
this.vehicleClass = Truck;
}
return new this.vehicleClass( options );
};
// Create an instance of our factory that makes cars
var carFactory = new VehicleFactory();
var car = carFactory.createVehicle( {
vehicleType: "car",
color: "yellow",
doors: 6 } );
// Test to confirm our car was created using the vehicleClass/prototype Car
// Outputs: true
alert( car instanceof Car );
// Outputs: Car object of color "yellow", doors: 6 in a "brand new" state
alert( car );
</script>
что происходит вот здесь?
VehicleFactory.prototype.vehicleClass = Car;
// Our Factory method for creating new Vehicle instances
VehicleFactory.prototype.createVehicle = function ( options ) {
if( options.vehicleType === "car" ){
this.vehicleClass = Car;
}else{
this.vehicleClass = Truck;
}
return new this.vehicleClass( options );
};
Почему оно не поддерживает наследование
function bl(){
this.hoo=2
}
bl.prototype={rt:45}
function VehicleFactory() {}
VehicleFactory.prototype=new bl();
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