1. // 类的装饰器
    2. // 装饰器本身是一个函数
    3. // 类装饰器接受的参数是构造函数
    4. // 装饰器通过 @ 符号来使用
    6. function testDecorator(flag: boolean) {
    7.   if (flag) {
    8.     return function(constructor: any) {
    9.       constructor.prototype.getName = () => {
    10.         console.log('dell');
    11.       };
    12.     };
    13.   } else {
    14.     return function(constructor: any) {};
    15.   }
    16. }
    18. @testDecorator(true)
    19. class Test {}
    21. const test = new Test();
    22. (test as any).getName();
    1. function testDecorator() {
    2.   return function<T extends new (...args: any[]) => any>(constructor: T) {
    3.     return class extends constructor {
    4.       name = 'lee';
    5.       getName() {
    6.         return this.name;
    7.       }
    8.     };
    9.   };
    10. }
    12. const Test = testDecorator()(
    13.   class {
    14.     name: string;
    15.     constructor(name: string) {
    16.       this.name = name;
    17.     }
    18.   }
    19. );
    21. const test = new Test('dell');
    22. console.log(test.getName());