类装饰器

  2. function age(args:number = 0) {
  3.     return function (target:Function):void {
  4.         target.prototype.age = args;
  5.     }
  6. }
  8. @age(2)
  9. class Hello{
  10.     public name:string;;
  11.     constructor(){
  12.         this.name = 'name';
  13.     }
  14. }
  16. const hello1 = new Hello();
  17. console.log(hello1.name);
  18. console.log(hello1.age);    //    2