装饰器在try catch中的应用

const userInfo: any = undefined;
function catchError(msg: string) {
  return function(target: any, key: string, descriptor: PropertyDescriptor) {
    const fn = descriptor.value;
    descriptor.value = function() {
      try {
        fn();
      } catch (e) {
        console.log(msg);
      }
    };
  };
}
class Test {
  @catchError('userInfo.name 不存在')
  getName() {
    return userInfo.name;
  }
  @catchError('userInfo.age 不存在')
  getAge() {
    return userInfo.age;
  }
  @catchError('userInfo.gender 不存在')
  getGender() {
    return userInfo.gender;
  }
}
const test = new Test();
test.getName();
test.getAge();