无法从angular中的服务读取属性

@Injectable()
export class MyService {
  myProperty: string;

  constructor() {
    this.myProperty = 'Hello World';
  }
}

@Injectable()
export class MyService {
  public myProperty: string;

  constructor() {
    this.myProperty = 'Hello World';
  }
}

@Component({
  selector: 'app-my-component',
  template: '...',
})
export class MyComponent {
  constructor(private myService: MyService) {
    console.log(this.myService.myProperty); // 可以访问服务的属性
  }
}

@NgModule({
  declarations: [MyComponent],
  providers: [MyService], // 添加服务到providers数组
})
export class MyModule { }