装饰模式

abstract class Component{
     public abstract void Operation();
}
class ConcreteComponent extend Component{
     public Operation(){
         console.log（“具体对象操作”）；
     }
}
abstract class Decorator extend Component{
     protected Component component;
     public setComponent(Component component){
          this.component = component;
     }
     public Operation(){
          if(this.component != null){
               component.Operation();
          }
     }
}
class ConcreteDecoratorA extend Decorator{
     private string addedState;
     public Operation(){
          super.Operation();
          addedState = "new State";
          console.log("具体装饰对象A操作");
     }
}
class ConcreteDecoratorB extend Decorator{
     public Operation(){
          super.Operation();
          addedBehavior();
          console.log("装饰对象B的操作");
     }
     private addedBehavior(){}
}
class Main{
     ConcreteComponent c = new ConcreteComponent();
     ConcreteDecoratorA d1 = new ConcreteDecoratorA();
     ConcreteDecoratorB d2 = new ConcreteDecoratorB();

     d1.setComponent(c);
     d2.setComponent(d1);
     d2.Operation();
}