[英]Router.use() requires middleware function but got a undefined at function use
[英]Router.use() requires a middleware function but got undefined
我想使用nodejs制作身份驗證應用程序並得到像標題一樣的錯誤:(
但是 app.js 的代碼已經是這樣了
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var session = require('express-session')
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(session({
secret: '123456cat',
resave: false,
saveUninitialized: true,
cookie: { maxAge: 60000 }
}))
app.use(express.static(path.join(__dirname, 'public')));
var registrationRouter = require('./routes/registration-route').default;
var loginRouter = require('./routes/login-route').default;
var dashboardRouter = require('./routes/dashboard-route').default;
var logoutRouter = require('./routes/logout-route');
app.use('/', registrationRouter);
app.use('/', loginRouter);
app.use('/', dashboardRouter);
app.use('/', logoutRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
app.listen(3000);
module.exports = app;
這是注冊-route.js
var express = require('express');
var router = express.Router();
var db = require('../database');
// to display registration form
router.get('/register', function(req, res, next) {
res.render('registration-form');
});
// to store user input detail on post request
router.post('/register', function(req, res, next) {
inputData ={
username: req.body.username,
email_address: req.body.email_address,
password: req.body.password,
confirm_password: req.body.confirm_password
}
// check unique email address
var sql='SELECT * FROM registration WHERE email_address =?';
db.query(sql, [inputData.email_address] ,function (err, data, fields) {
if(err) throw err
if(data.length>1){
var msg = inputData.email_address+ "was already exist";
}else if(inputData.confirm_password != inputData.password){
var msg ="Password & Confirm Password is not Matched";
}else{
// save users data into database
var sql = 'INSERT INTO registration SET ?';
query(sql, inputData, function (err, data) {
if (err) throw err;
});
var msg ="Your are successfully registered";
}
res.render('registration-form',{alertMsg:msg});
})
});
module.exports = router;
登錄-route.js
var express = require('express');
var router = express.Router();
var db = require('../database');
/* GET users listing. */
router.get('/login', function(req, res, next) {
res.render('login-form');
});
router.post('/login', function(req, res){
var email = req.body.email;
var password = req.body.password;
var sql='SELECT * FROM registration WHERE email_address =? AND password =?';
db.query(sql, [email, password], function (err, data, fields) {
if(err) throw err
if(data.length>0){
req.session.loggedinUser= true;
req.session.email= email;
res.redirect('/dashboard');
}else{
res.render('login-form',{alertMsg:"Your Email Address or password is wrong"});
}
})
})
module.exports = router;
注銷-route.js
var express = require('express');
var router = express.Router();
/* GET users listing. */
router.get('/logout', function(req, res) {
req.session.destroy();
res.redirect('/login');
});
module.exports = router;
儀表板-route.js
var express = require('express');
var router = express.Router();
/* GET users listing. */
router.get('/dashboard', function(req, res, next) {
if(req.session.loggedinUser){
res.render('dashboard',{email:req.session.emailAddress})
}else{
res.redirect('/login');
}
});
module.exports = router;
我已經看到這樣的問題,但沒有一個答案適用於我的案例問題,我也嘗試過npm clear cache --force
但沒有任何改變
也已為node_modules
, package-lock
卸載並重新安裝,但總是出現相同的錯誤
更改所有這些:
var registrationRouter = require('./routes/registration-route').default;
刪除.default
所以你只有這個:
const registrationRouter = require('./routes/registration-route');
.default
是與 ESM 模塊一起使用的東西,而不是與 CommonJS 模塊一起使用的東西。
另外,你不應該再使用var
了。 現在已經過時了。 對這些使用const
。
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