首页 > 解决方案 > Typescript 编译的 Javascript 代码不起作用(variable.default.function())

问题描述

问题是从 home.ts 生成的 js 没有找到我的 index.js 类。我在 Typescript 中没有错误,但在运行 javascript 时出现了错误。

TypeError:index_1.default.login 不是 /Users/Jannik/Documents/Web/Willhub-ts/dist/controllers/home.js:12:37 在 Object 的函数。(/Users/Jannik/Documents/Web/Willhub-ts/dist/controllers/home.js:15:3) 在 Object.Module 的 Module._compile (internal/modules/cjs/loader.js:956:30)。 _extensions..js (internal/modules/cjs/loader.js:973:10) 在 Module.load (internal/modules/cjs/loader.js:812:32) 在 Function.Module._load (internal/modules/cjs /loader.js:724:14) 在 Module.require (internal/modules/cjs/loader.js:849:19) 在 require (internal/modules/cjs/helpers.js:74:18) 在 Object. (/Users/Jannik/Documents/Web/Willhub-ts/dist/app.js:20:24) 在 Module._compile (internal/modules/cjs/loader.js:956:30)

知道这可能来自哪里吗?

主页.ts:

router.get('/', Index.login());
router.get('/', Index.index());

主页.js:

router.get('/', index_1.default.login());
router.get('/', index_1.default.index());

索引.ts

import {Request, Response} from 'express';


export default class Index {
private static _index: Function;
private static _login: Function;

constructor(){
    this.constructIndex();
    this.constructLogin();
}

//Private Methods:
private constructIndex(): void {
    Index._index = function (req: Request, res: Response, next) {

        res.render("main", { "header-enabled": true, "nav-enabled": true })
        next();
    }
}

private constructLogin(): void {
    Index._index = function (req: Request, res: Response, next) {
        res.render("main", { "header-enabled": true, "nav-enabled": true })
        const isLoggedIn: boolean = true;
    }
}

//Public Methods:
public static get index() : Function {
    return this._index;
}

public static get login(): Function {
    return this._login;
}

}

索引.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });


class Index {
constructor() {
    this.constructIndex();
    this.constructLogin();
}
//Private Methods:
constructIndex() {
    Index._index = function (req, res, next) {
        res.render("main", { "header-enabled": true, "nav-enabled": true });
        next();
    };
}
constructLogin() {
    Index._index = function (req, res, next) {
        res.render("main", { "header-enabled": true, "nav-enabled": true });
        const isLoggedIn = true;
    };
}
//Public Methods:
static get index() {
    return this._index;
}
static get login() {
    return this._login;
}
}
exports.default = Index;
//# sourceMappingURL=index.js.map

标签: javascripttypescript

解决方案


首先,您可能是错误的,因为我猜constructLogin()它应该分配:Index._login

private constructLogin(): void {
    // -----\/------------------
    Index._index = function (req: Request, res: Response, next) {
        res.render("main", { "header-enabled": true, "nav-enabled": true })
        const isLoggedIn: boolean = true;
    }
}

如果您解决了这个问题,请先检查您是否使用Index.login()过,然后再创建实例。那是因为:

  • Index.login是一个 getter 函数,它返回Index._login
  • Index.login()调用结果Index._login,但是...
  • Index._login设置在constructLogin(),并且...
  • constructLogin()constructor()函数中调用

如果您Index.login()在创建实例之前调用,Index._login将是undefined

class Index {
constructor() {
    this.constructIndex();
    this.constructLogin();
}
//Private Methods:
constructIndex() {
    Index._index = function (req, res, next) {
        res.render("main", { "header-enabled": true, "nav-enabled": true });
        next();
    };
}
constructLogin() {
    // NOTICE: Assigns `_login` instead
    Index._login = function (req, res, next) {
        res.render("main", { "header-enabled": true, "nav-enabled": true });
        const isLoggedIn = true;
    };
}
//Public Methods:
static get index() {
    return this._index;
}
static get login() {
    return this._login;
}
}

console.log(Index._login); // undefined

let i = new Index();

console.log(Index._login); // function


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