Angular 5-如何向构造函数添加多个参数？

constructor(private userService: UserService, private loggerService: LoggerService) {
  // 构造函数逻辑
}

import { UserService } from './user.service';
import { LoggerService } from './logger.service';

@NgModule({
  declarations: [
    // 组件声明
  ],
  imports: [
    // 模块导入
  ],
  providers: [
    UserService,
    LoggerService
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

ngOnInit() {
  this.userService.getUser().subscribe(user => {
    this.loggerService.log('用户信息：', user);
  });
}