Javascript TypeError:从导入的类[TypeScript]调用方法时，无法读取undefined的属性

调试了几个小时后，我在网上也找不到任何东西

我有一个控制器，它调用服务方法以获取数据：

路线：路线/检查。ts

import {Request, Response} from "express";
import { InspectionsController } from "../controllers";

export class Routes {

    public inspectionsController: InspectionsController = new InspectionsController()
    public  routes(app): void {


        // Inspection detail
        app.route('/data/inspections/:inspectionId')
        // get specific inspection
            .get(this.inspectionsController.getInspectionByID)

        // Inspection detail
        app.route('/data/inspections')
        // get specific inspection
            .get(this.inspectionsController.getInspections)

    }
}

    import { Request, Response } from 'express';
    import { InspectionsService } from '../services/inspections';

    export class InspectionsController {
        public inspectionsService: InspectionsService = new InspectionsService();
        public async getInspections (req: Request, res: Response) {
            try {
                const response = await this.inspectionsService.getInspections();
                res.json(response);
            }catch (e) {
                console.log(e.toString())
            }
        }

        public getInspectionByID (req: Request, res: Response) {
            res.json('You reached getInspectionByID in the controller Wohoooo!');
        }
}

    export class InspectionsService {
     public  async getInspections(){
         return 'You reached getInspections in the service Wohoooo!';
    }
}

控制器：控制器/检查。ts

import {Request, Response} from "express";
import { InspectionsController } from "../controllers";

export class Routes {

    public inspectionsController: InspectionsController = new InspectionsController()
    public  routes(app): void {


        // Inspection detail
        app.route('/data/inspections/:inspectionId')
        // get specific inspection
            .get(this.inspectionsController.getInspectionByID)

        // Inspection detail
        app.route('/data/inspections')
        // get specific inspection
            .get(this.inspectionsController.getInspections)

    }
}

    import { Request, Response } from 'express';
    import { InspectionsService } from '../services/inspections';

    export class InspectionsController {
        public inspectionsService: InspectionsService = new InspectionsService();
        public async getInspections (req: Request, res: Response) {
            try {
                const response = await this.inspectionsService.getInspections();
                res.json(response);
            }catch (e) {
                console.log(e.toString())
            }
        }

        public getInspectionByID (req: Request, res: Response) {
            res.json('You reached getInspectionByID in the controller Wohoooo!');
        }
}

    export class InspectionsService {
     public  async getInspections(){
         return 'You reached getInspections in the service Wohoooo!';
    }
}

服务：服务/检查。ts

import {Request, Response} from "express";
import { InspectionsController } from "../controllers";

export class Routes {

    public inspectionsController: InspectionsController = new InspectionsController()
    public  routes(app): void {


        // Inspection detail
        app.route('/data/inspections/:inspectionId')
        // get specific inspection
            .get(this.inspectionsController.getInspectionByID)

        // Inspection detail
        app.route('/data/inspections')
        // get specific inspection
            .get(this.inspectionsController.getInspections)

    }
}

    import { Request, Response } from 'express';
    import { InspectionsService } from '../services/inspections';

    export class InspectionsController {
        public inspectionsService: InspectionsService = new InspectionsService();
        public async getInspections (req: Request, res: Response) {
            try {
                const response = await this.inspectionsService.getInspections();
                res.json(response);
            }catch (e) {
                console.log(e.toString())
            }
        }

        public getInspectionByID (req: Request, res: Response) {
            res.json('You reached getInspectionByID in the controller Wohoooo!');
        }
}

    export class InspectionsService {
     public  async getInspections(){
         return 'You reached getInspections in the service Wohoooo!';
    }
}

我的问题是，我的程序只达到控制器级别，而没有达到服务级别。 我收到以下错误消息：

TypeError: Cannot read property 'inspectionsService' of undefined

---

非常感谢各位，任何帮助都是非常感谢的

在控制器中尝试此操作

构造函数（私有检查服务：检查服务）{}

public-getInspections（）{
返回新承诺（解决=>{
设置超时（（）=>{
resolve（'您在服务wohooo！中找到了getInspections！'）；
}, 2000);
});
}

看起来问题可能与路由器中调用的

inspectionsController.getInspections

的上下文有关

也许您可以对路由器进行以下更改，以确保从

Routes

实例的上下文调用

getInspections

——这些更改对您有用吗

export class Routes {

    public inspectionsController: InspectionsController = new InspectionsController()
    public  routes(app): void {


        // Inspection detail
        app.route('/data/inspections/:inspectionId')
        // get specific inspection
            .get(this.inspectionsController.getInspectionByID)

        // Inspection detail
        app.route('/data/inspections')
        // get specific inspection
        .get((req: Request, res: Response) => {

          // UPDATE: Move the invocation of getInspections() into an arrow function
          // so that the "this" context is that of the Routes instance
          this.inspectionsController.getInspections(req, res)
        })

    }
}

---

为什么在您的

inspections.ts

文件中有一个尾随

}

？最后一个

}

在

检查中。ts

可能会引起一些问题？嗨@Soufiane我能帮你什么忙吗？嗨@Dacre Denny，谢谢你的快速回答，巴德“我只是在粘贴代码时删除了一些东西，这就是为什么，但在我的IDE中我没有任何额外的东西。）:/嗨@Soufiane，我看不到任何异常。为什么你不在打电话给Wait的时候回复一个承诺？@Soufiane，我编辑了我的帖子，刚刚被收录在构造器中。这就像一个符咒，非常感谢你，巴德”，非常感谢：不客气！很高兴我能为您提供帮助-祝您的项目一切顺利：-）