Question

因此，尝试创建一个简单的模块来整理网页的帐户，并认为这很简单。创建一个包含一些函数的文件，将它们全部包装在module.exports中，然后让你的叔叔陷入困境。好吧，结果不是我的叔叔。

因此创建了以下文件：

module.exports = function(lameAccount) {
    lameAccount.initAccount( function ( myId, myName, done) {
        console.log("Will create" + myId);
        console.log("Name is " + myName);
        done(null,false,"This is just a hello");

    })
}

在需要它的部分（api路由器）

var lameAccountant                    = require('../modules/lameaccount.js')

然后调用我们的函数

lameAccount.initAccount(blockRecord._id, blockRecord.betName)

然而，当我尝试使用此功能时，我得到了

/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/mpromise/lib/promise.js:108
  if (this.ended && !this.hasRejectListeners()) throw reason;
                                                      ^
TypeError: undefined is not a function
    at EventEmitter.<anonymous> (/Users/bengtbjorkberg/WebstormProjects/Challange/routes/api.js:119:22)
    at EventEmitter.<anonymous> (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/mpromise/lib/promise.js:175:45)
    at EventEmitter.emit (events.js:110:17)
    at Promise.safeEmit (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/mpromise/lib/promise.js:81:21)
    at Promise.fulfill (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/mpromise/lib/promise.js:94:24)
    at Promise.resolve (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/lib/promise.js:113:23)
    at model.<anonymous> (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/lib/document.js:1578:39)
    at next_ (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/hooks-fixed/hooks.js:89:34)
    at EventEmitter.fnWrapper (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/hooks-fixed/hooks.js:186:8)
    at EventEmitter.<anonymous> (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/mpromise/lib/promise.js:175:45)
    at EventEmitter.emit (events.js:110:17)
    at Promise.safeEmit (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/mpromise/lib/promise.js:81:21)
    at Promise.fulfill (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/mpromise/lib/promise.js:94:24)
    at p1.then.then.self.isNew (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/lib/model.js:260:27)
    at newTickHandler (/Users/bengtbjorkberg/WebstormProjects/Challange/node_modules/mongoose/node_modules/mpromise/lib/promise.js:229:18)
    at process._tickCallback (node.js:355:11)

==============编辑第一个答案============

所以，如果这是一个匿名函数（确定它，为什么这样做）

// expose this function to our app using module.exports
module.exports = function(passport) {

    // =========================================================================
    // passport session setup ==================================================
    // =========================================================================
    // required for persistent login sessions
    // passport needs ability to serialize and unserialize users out of session

    // used to serialize the user for the session
    passport.serializeUser(function(user, done) {
        done(null, user.id);
    });

    // used to deserialize the user
    passport.deserializeUser(function(id, done) {
        User.findById(id, function(err, user) {
            done(err, user);
        });
    });

或者确实是apis本身

module.exports = function(app, passport) {

    var urlencodedParser = bodyParser.urlencoded({ extended: false })
    // parse application/json
    app.use(bodyParser.json())


    app.get('/api/userList', function(req, res){
       User.find({}, {'_id':1, 'userName':1},function(err, users) {
           if (err)
            res.send(err)

           res.json(users);
       })
    });

这就是app.use所做的，允许你在匿名函数中滑动。

Answer 1

您将匿名函数附加到module.exports，因此initAccount为undefined。

使用匿名函数：

var lameAccountantModule = require('../modules/lameaccount.js')

// call the function like you would the anonymous function
lameAccountModule(lameAccount)

或者公开你想要的那个，initAccount，而不是：

exports.initAccount = function ( myId, myName, done) {
        console.log("Will create" + myId);
        console.log("Name is " + myName);
        done(null,false,"This is just a hello");
}

然后在你的另一个文件中：

var lameAccount = require('../modules/lameaccount.js')
lameAccount.initAccount(myId, myName, callback)

为平均应用创建导出模块

1 个答案: