JS composition

function Actor(//put arguments here) {
    var actor = new GameObject();
    var thinkDelay = 0;
    var agroRadius = 0;
    ...
    var create:function(...){
        actor.addComponent(ai..);
        actor.addComponent(life..);
        actor.addComponent(physics..);
        actor.addComponent(rendering..);
        actor.addComponent(animation..);
        actor.addComponent(etc..);
    }
}

var zombie = new Actor();
zombie.thinkDelay = 5;
zombie.agroRadius = 25;
zombie.create();