为什么我要重用[Object Promise]而不是回调

Question

我正在尝试建立一个使用express-validator的注册页面。但是，无论何时尝试运行我的应用程序，我都会收到以下错误。自从我最近过渡到中间件（6.2）的较新版本以来，我猜测它与Validator部分有关。在此之前，它已经过时了，但是可以正常工作。

   Error: Route.post() requires a callback function but got a [object Promise] 

这里是POST

// Register - POST
router.post('/register', [
    check('userphonenumber', 'a user phone number is required').not().isEmpty(),
    check('fname', 'First name field is required').not().isEmpty(),
    check('lname', 'Last name field is required').not().isEmpty(),
    check('email', 'Email field is required').not().isEmpty(),
    check('email', 'Please use a valid email address').not().isEmpty()(),
    check('username', 'Username field is required').not().isEmpty(),
    check('password', 'Password field is required').not().isEmpty(),
    check('passwordConfirm', 'Passwords do not match').equals(body.password),
    check('zipCode', 'Zip Code field is required').not().isEmpty(),
    ], function(req, res) {
    // Get Form Values
    var fname           = req.body.fname;
    var lname           = req.body.lname;
    var email           = req.body.email;
    var username        = req.body.username;
    var phonenumber     = req.body.phonenumber;
    var password        = req.body.password;
    var passwordConfirm = req.body.passwordConfirm;
    var zipCode             = req.body.zipCode;


    // Check for errors
    const result = validationResult(req);
    var errors = result.errors;

    console.log(errors);

          if (!result.isEmpty()) {
            res.render('techregister', {
            errors: errors,
            fname: fname,
            lname: lname,
            email: email,
            username:username,
            password: password,
            passwordConfirm: passwordConfirm,
            zip : zipCode
            });
          }
     else {
        var newTech = {
            fname: fname,
            lname: lname,
            phonenumber: phonenumber,
            email: email,
            username:username,
            password: password,
            zipCode: zipCode,   
        }

        bcrypt.genSalt(10, function(err, salt){
            bcrypt.hash(newTech.password, salt, function(err, hash){
                newTech.password = hash;
                        techdb.users.insert(newTech, function(err, doc){
                            if(err){
                                res.send(err);
                            } else {
                                console.log('User Added...');


                                //Success Message
                                req.flash('success', 'You are registered please confirm with your email before you log in');

                                // Redirect after register
                                res.location('/admins/login');
                                res.redirect('/admins/login');
                            } 
                        });
                    });

                });
            }
        });

Answer 1

第二封电子邮件check带有多余的括号（）

router.post('/register', [
check('userphonenumber', 'a user phone number is required').not().isEmpty(),
check('fname', 'First name field is required').not().isEmpty(),
check('lname', 'Last name field is required').not().isEmpty(),
check('email', 'Email field is required').not().isEmpty(),
check('email', 'Please use a valid email address').not().isEmpty(),
], function(req, res)
{
//...
});

Answer 2

也许问题是由这段代码引起的。

const result = validationResult(req);
var errors = result.errors;

根据官方文档result没有任何errors属性。您可能需要此var errors = result.array();，因此错误是任何错误的数组。