16-TypeScript装饰器模式

interface IPeople{
   do():void;
}
class People implements IPeople{
    public  do():void{
         console.log("Eat");
    }
}

class DecoratorPeople {
    protected people:IPeople;
    public SetPeople(ipeople:IPeople):void{
        this.people=ipeople;
    }
    public do():void{
        if(this.people){
            this.people.do();
        }
    }
}

class ProgrammerPeople extends DecoratorPeople {
    public do():void{
        super.do();
        console.log("Coding");
    }
}

class TesterPeople extends DecoratorPeople{
    public do():void{
        super.do();
        console.log("Testing");
    }
}

var p=new People();
var pp=new ProgrammerPeople();
var tp=new TesterPeople();
pp.SetPeople(p);
tp.SetPeople(pp);
tp.do();