javascript - Router.use() 需要一个中间件函数，但得到了一个未定义的

Question

我的 index.js 中有这段代码

...
import userRoutes from './src/routes/userRoutes';
import invoicesRoutes from './src/routes/invoicesRoutes';
import authMiddleware from "./src/middlewares/authMiddleware";
...
const app = express();
...
app.use('/user', authMiddleware, userRoutes(app));
app.use('/invoices', authMiddleware, invoicesRoutes(app));

我的授权中间件

const authMiddleware = (req, res, next) => {
    if (req.headers && req.headers.authorization && req.headers.authorization.split(' ')[0] === 'JWT') {
        console.log(req.headers.authorization.split(' ')[0]);
        next();
    } else {
        console.log('else');
        next();
    }
};

export default authMiddleware;

还有我的路线之一:

import { register, login } from '../controllers/authController';

const userRoutes = (app) => {
    app.route('/user/signup')
        .post(register);
    app.route('/user/login')
        .post(login);
};

export default userRoutes;

我收到一个错误:

throw new TypeError('Router.use() requires a middleware function but got a ' + gettype(fn)) ^

TypeError: Router.use() requires a middleware function but got a undefined

怎么了？

Answer 1

您将路由初始化作为中间件功能传递 app.use('/user', authMiddleware, userRoutes(app));

在这行代码中，userRoutes(app) 应该返回的是 function(req,res[,next]){}

应该是这样的

app.use('/user', authMiddleware, (req, res, next) => {
        userRoutes(app);
        next()
})

而你所做的是

app.use('/user', authMiddleware, (app) => {
    app.route('/user/signup').post(register);
    app.route('/user/login').post(login);
})

错了

这里似乎有一些错误的逻辑，因为根据我的理解，你将不得不调用 http://localhost/user 来初始化路由，并且由于 express 的中间件包含，这将无法正常工作.

再次根据我的理解，你正在尝试做的应该看起来更像这样

...
import userRoutes from './src/routes/userRoutes';
import invoicesRoutes from './src/routes/invoicesRoutes';
...
const app = express();
userRoutes(app);
invoicesRoutes(app);

和

import { register, login } from '../controllers/authController';
import authMiddleware from "./middleware";
const userRoutes = (app) => {
    app.post('/user/signup', authMiddleware, register);
    app.post('/user/login', authMiddleware, login);
};

export default userRoutes;