javascript - 无法从类的方法调用构造函数中声明的属性

Question

我有一个 HomeController，它有方法索引。我已经在构造函数中声明了 this.data 变量。当我在 index 方法中调用 this.data 时，出现错误消息，如

类型错误:无法读取未定义的属性“数据”

这个 HomeController:

import Controller from "./../../vendor/controller";
import * as express from "express";
import hException from "./../helper/exception.helper";

class HomeController extends Controller {
    data:object
    constructor(){
        super()
        this.data = {
            tes: 'tes'
        }
    }
    async index(request:express.Request, response:express.Response, next:express.NextFunction):Promise<any>{
        try {
            let template =  'home/index';
            //next to viewer
            response.render(template, { layout: 'dashboard', data: this.data});
        } catch (error) {
            next(new hException(error))
        }
    }
}

export default HomeController

路由调用HomeController:

import * as express from "express";
import Controller from "./../../controller/home.controller";

import { Jwt as MJwt } from "./../../middleware/auth.middleware";

class Routes {
    private router:express.Router = express.Router()
    private path:string = '/'
    private controller:Controller
    private MJwt = new MJwt()
    constructor() {
        this.controller = new Controller;
        this.run()
    }

    public run(){
        this.router.route(this.path)
            .get(
                this.controller.index
            );
    }
}

export default Routes

Answer 1

通过使用箭头函数 声明HomeController 的方法解决了这个问题link了解详情。或使用绑定(bind)函数 link了解详情。

Solved with arrow function