我使用express-formidable来处理表单的上载。表单的常规字段已安装到req.fields。
由表单上载的文件被挂载到req.files，并且文件存储在public/img目录中。然后验证参数。
通过验证后，用户信息将插入到MongoDB中。如果成功，它将跳转到主页并显示“注册成功”的通知。如果失败（如果用户名被占用），它将跳回到注册页面并显示“用户名已被占用”通知。
TypeError [ERR_INVALID_CALLBACK]：回调必须是一个函数
const fs = require('fs')
const path = require('path')
const sha1 = require('sha1')
const express = require('express')
const router = express.Router()
const UserModel = require('../models/users')
const checkNotLogin = require('../middlewares/check').checkNotLogin
//Get /register The Page to Create account
router.get('/', checkNotLogin, function (req, res, next){
res.render('register')
})
router.post('/', checkNotLogin, function(req, res, next){
const name = req.fields.name
const gender = req.fields.gender
const emailaddress = req.fields.emailaddress
const bio = req.fields.bio
const avatar = req.files.avatar.path.split(path.sep).pop()
let password = req.fields.password
const repassword = req.fields.repassword
try {
if (!(name.length >= 1 && name.length <= 10)) {
throw new Error('Username can not be longer than 10 characters')
}
if (['m', 'f', 'x'].indexOf(gender) === -1) {
throw new Error('Gender only can be m、f or x')
}
if(!emailaddress.endsWith('.co.uk')){
throw new Error('Email Address should be an academic address')
}
if (!(bio.length >= 1 && bio.length <= 30)) {
throw new Error('Please organise your personal description with in 30 characters')
}
if (!req.files.avatar.name) {
throw new Error('Please choose your avator')
}
if (password.length < 6) {
throw new Error('Password should be longer than 6 characters')
}
if (password !== repassword) {
throw new Error('Re-enter the password you set')
}
} catch (e) {
// register fail, delete the avator
fs.unlink(req.files.avatar.path)
req.flash('error', e.message)
return res.redirect('/register')
}
// text password encryption
password = sha1(password)
// information wait to be enter into database
let user = {
name: name,
password: password,
emailaddress:emailaddress,
gender: gender,
bio: bio,
avatar: avatar
}
// enter user information into database
UserModel.create(user)
.then( function (result) {
user = result.ops[0]
// delete password，store user information into session
delete user.password
req.session.user = user
//Write into flash
req.flash('success', 'Account Successfully created')
// Jump to the home
res.redirect('/posts')
})
.catch(function (e) {
// Account create failure, delete avator
fs.unlink(req.files.avatar.path)
// if username already been use return to register page
if (e.message.match('duplicate key')) {
req.flash('error', 'username already be taken')
return res.redirect('/register')
}
next(e)
})
})
module.exports = router
我不确定哪里出了问题 我想已经有功能了 任何帮助将不胜感激
这是完整的错误消息：
TypeError [ERR_INVALID_CALLBACK]: Callback must be a function
at makeCallback (fs.js:137:11)
at Object.unlink (fs.js:936:14)
at D:\tttt\CVsWeb\routes\register.js:48:1 express\lib\router\layer.js:95:5)
at Layer.handle [as handle_request] (D:\tttt\CVsWeb\node_modules\137:13 express\lib\router\layer.js:95:5)
at next (D:\tttt\CVsWeb\node_modules\express\lib\router\route.js:express\lib\router\layer.js:95:5)137:13) 137:13)
at checkNotLogin (D:\tttt\CVsWeb\middlewares\check.js:14:9) \route.js:112:3)
at Layer.handle [as handle_request(D:\tttt\CVsWeb\node_modules\express\lib\router\layer.js:95:5)express\lib\router\layer.js:95:5)
at next (D:\tttt\CVsWeb\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (D:\tttt\CVsWeb\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (D:\tttt\CVsWeb\node_modules\express\lib\router\layer.js:95:5)
答案 0 :(得分：1)
fs.unlink是异步的，需要将回调函数作为第二个参数传递。
尝试使用fs.unlinkSync(req.files.avatar.path)或将函数作为第二个参数插入unlink fs.unlink(req.files.avatar.path, function(){console.log('Deleted avatar')})
router.post('/', checkNotLogin, function(req, res, next) {
const name = req.fields.name
const gender = req.fields.gender
const emailaddress = req.fields.emailaddress
const bio = req.fields.bio
const avatar = req.files.avatar.path.split(path.sep).pop()
let password = req.fields.password
const repassword = req.fields.repassword
try {
if (!(name.length >= 1 && name.length <= 10)) {
throw new Error('Username can not be longer than 10 characters')
}
if (['m', 'f', 'x'].indexOf(gender) === -1) {
throw new Error('Gender only can be m、f or x')
}
if (!emailaddress.endsWith('.co.uk')) {
throw new Error('Email Address should be an academic address')
}
if (!(bio.length >= 1 && bio.length <= 30)) {
throw new Error('Please organise your personal description with in 30 characters')
}
if (!req.files.avatar.name) {
throw new Error('Please choose your avator')
}
if (password.length < 6) {
throw new Error('Password should be longer than 6 characters')
}
if (password !== repassword) {
throw new Error('Re-enter the password you set')
}
} catch (e) {
// register fail, delete the avator
fs.unlinkSync(req.files.avatar.path) //Try this!
req.flash('error', e.message)
return res.redirect('/register')
}
// text password encryption
password = sha1(password)
// information wait to be enter into database
let user = {
name: name,
password: password,
emailaddress: emailaddress,
gender: gender,
bio: bio,
avatar: avatar
}
// enter user information into database
UserModel.create(user)
.then(function(result) {
user = result.ops[0]
// delete password，store user information into session
delete user.password
req.session.user = user
//Write into flash
req.flash('success', 'Account Successfully created')
// Jump to the home
res.redirect('/posts')
})
.catch(function(e) {
// Account create failure, delete avator
fs.unlinkSync(req.files.avatar.path) //Also this one
// if username already been use return to register page
if (e.message.match('duplicate key')) {
req.flash('error', 'username already be taken')
return res.redirect('/register')
}
next(e)
})
})