TypeError：undefined不是nodejs中的函数

这是我的users.js模型。

var mongoose = require('mongoose') , crypto = require('crypto') , mongoTypes = require('mongoose-types'); mongoTypes.loadTypes(mongoose, 'email'); mongoose.connect('mongodb://localhost/popbroker'); function hash1 (msg, key) { return crypto.createHmac('sha256', key).update(msg).digest('hex'); }; function required(val) { return val && val.length; } var Schema = mongoose.Schema , ObjectId = Schema.ObjectId; var UserSchema = new Schema({ username: { type: String, validate: [required,"Username is required"], index: {unique: true} }, email: { type: mongoose.SchemaTypes.Email, validate: [required, 'Email required'], index: { unique: true } }, password: { type: String, validate: [required, 'Password required'], }, socialauth:{ type:String, createdAt: { type: Date, 'default': Date.now } }); var UserApiSchema = new Schema({ user :ObjectId, apiKey: { type: String, validate: [required, 'Senha é obrigatório'], }, createdAt: { type: Date, 'default': Date.now } }); UserSchema.path('email').validate(function (v, fn) { User.count({email: v}, function (err, val) { if (err) fn(false); fn(val==0); }); }, 'Email exists!'); UserSchema.path('username').validate(function(v,fn){ User.count({username:v},function(err,val){ if(err) fn(false); fn(val==0); }); },'Username exists'); UserApiSchema.path('apiKey').validate(function(v,fn){ UserApi.count({apiKey:v},function(err,val){ if(err) fn(false); fn(val == 0); }); }, 'Api Key wrong'); UserSchema.statics.authenticate = function (email, password, fn) { this.findOne({email: email}, function (err, user) { if (!user) return fn(new Error('cannot find user')); if (user.password == hash1(password, conf.secret)) return fn(null, user); // Otherwise password is invalid fn(new Error('invalid password')); }) ;}; UserApiSchema.statics.createApi = function(user,fn){ var instance = new UserApi(); instance.user = user; instance.apiKey = "asdasdacas121213dasasd"; console.log("username is " + user.username); instance.save(function(err){ fn(err,instance); }); }; UserSchema.statics.getUser = function(userid){ var user = mongoose.model('User', UserSchema); var query = user.findOne({'_id':userid}) query.exec(function (err, user) { if (err) return handleError(err); console.log(user.username); return user; }); } UserApiSchema.statics.getUser = function(apiKey,fn){ var usAp = UserApiSchema var userApi = mongoose.model('UserApi', UserApiSchema); var user = mongoose.model('User', UserSchema); var query = userApi.findOne({ 'apiKey': apiKey }); query.exec(function (err, userApi) { if (err) return handleError(err); console.log(userApi.user); user = user.getUser(userApi.user); fn(err, userApi);;// Space Ghost is a talk show host. }); }; UserSchema.statics.newUser = function (email, password,username, fn) { var instance = new User(); var apiInstance = new UserApi(); instance.email = email; instance.password = require('crypto').createHash('sha256').update(password).update('salt').digest('hex'); instance.username = username; instance.save(function (err) { fn(err, instance); }); }; UserSchema.statics.resetPassword = function(userId, callback) { var newPassword = ''; newPassword = newPassword.randomString(6); var cripto = password; var data = {} data.password = crypto; this.update({_id: userId} , {$set: data} , {multi:false,safe:true} , function( error, docs ) { if (error) { callback(error); } else { callback(null, newPassword); } }); } var LinkSchema = new Schema({ user: ObjectId, text: { type: String, validate: [required,"Text is required"], index: {unique: true} }, body: { type: String, validate: [required, 'Body is required'], index: { unique: true } }, createdAt: { type: Date, 'default': Date.now } }) /* Exporting findByid function to return back a link based on an id. */ LinkSchema.statics.newLink = function (text, body,user, fn) { var instance = new Link(); instance.text = text; instance.body =body; instance.user = user; instance.save(function (err) { fn(err, instance); }); }; /* Export findAll function to return back all the links. */ exports.findAll = function(req,res){ console.log("Retrieving all the links"); db.collection('links',function(err,collection){ collecction.find().toArray(function(err,items){ res.send(items); }); }); }; Link = mongoose.model('Link', LinkSchema); exports.Link = Link; User = mongoose.model('User', UserSchema); UserApi = mongoose.model('UserApi',UserApiSchema); exports.UserApi = UserApi; exports.User = User; 

由于我是nodejs的新手，很难理解这个错误是什么意思，或者为什么会发生。 因此，错误是什么意思，如何摆脱它？

编辑：这是我的新用户调用。

 app.post( '/signup/', function(req, res) { {console.log(req.body.username); User.newUser( req.body.email, req.body.password,req.body.username,req.body.apiKey,"pocket", function (err, user) { if ((user)&&(!err)) { console.log(user.username) UserApi.createApi( user,function(err,userapi){ if((!err)){ console.log("Api created"); res.send("APi created"); } else{ if(err.errors.apiKey){ res.send(err); } } }); req.session.regenerate(function(){ req.session.user = user._id; //res.send("Success here!"); }); } else { if (err.errors.email) { res.send(err) console.log(req.body.password); console.log(req.body.email); console.log(req.body); } if (err.errors.username) { res.send(err) console.log(req.body.password); console.log(req.body.email); console.log(req.body); } } }); } }); 

Answer 1

随着你的编辑，你比新newUser传递更多的论据的问题是期待。 这导致fn被设置为req.body.apiKey的值，这明显是undefined ：

 UserSchema.statics.newUser = function (email, password, username, fn) { // ... }); User.newUser( // set to... req.body.email, // => email req.body.password, // => password req.body.username, // => username req.body.apiKey, // => fn "pocket", // => (unnamed), arguments[4] function(err, user) { // => (unnamed), arguments[5] // ... } }); 

你要么编辑函数来命名额外的参数，要么把它们从调用中移除，因为如果它们实际上不是必须的（因为你在newUser和预期的callback中都创build了一个UserApi实例）。

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[ 原来 ]

这个错误意味着你正试图调用undefined的值。

一种可能性是fn参数，因为newUser会尝试调用它， newUser是否是一个function 。

 UserSchema.statics.newUser = function (email, password,username, fn) { //... fn(err, instance); //... }); 

但是， fn的价值取决于你如何调用newUser ：

 // fn = undefined User.newUser('email@domain', 'password', 'username'); // fn = function User.newUser('email@domain', 'pass', 'user', function (err, user) { }); 

因此，在尝试调用它之前，您要么testingfn是一个function ：

 instance.save(function (err) { if (typeof fn === 'function') { fn(err, instance); } }); 

或者，您可以直接将fn传递给Model#save ，这在fn undefined时已经处理：

 instance.save(fn);