SOURCE

class Plane {
    fire(){
        console.log("发射普通子弹")
    }
}

class MissileDecorator {
   constructor(plane){
       this.plane = plane;
   }
   fire(){
       this.plane.fire();
       console.log("发射导弹");
   }
}

class AtomDecorator {
    constructor(plane){
        this.plane = plane 
    }
    fire(){
        this.plane.fire();
        console.log("发射原子弹")
    }
}

var plane = new Plane();
plane = new MissileDecorator(plane);
plane.fire();
console.log(plane.fire);
plane = new AtomDecorator(plane);
plane.fire();
console.log(plane.fire);