JS Polymorfizmus

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function Zviera() {
    this.meno = "Zviera";
    this.toString = function () {
        return "Moje meno je: " + this.meno;
    };
}

function PsoviteSelmy() {
    this.meno = "Psovite selmy";
}

function Vlk() {
    this.meno = "Vlk";
}

PsoviteSelmy.prototype = new Zviera();
Vlk.prototype = new PsoviteSelmy();

PsoviteSelmy.prototype.constructor = PsoviteSelmy;
Vlk.prototype.constructor = Vlk;

var arktickyVlk = new Vlk();
document.write(arktickyVlk.toString() + "<br />");
document.write("Je arkticky vlk vlkom: " + (arktickyVlk instanceof Zviera) + "<br />");

Zviera.prototype.zvuk = "Grrrrr";
Zviera.prototype.getZvuk = function () {
    return "Je to: " + this.meno + " a robi: " + this.zvuk;
};

PsoviteSelmy.prototype.zvuk = "Haf";
Vlk.prototype.zvuk = "Grrr haf";

document.write(arktickyVlk.getZvuk() + "<br />");