我的代码在这里有什么问题是我的app.js文件，当我点击npm start时，它会给出如下错误：
TypeError('app.use() requires middleware functions');
我使用了以下代码。
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var session = require('express-session');
var expressValidator = require('express-validator');
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var multer = require('multer');
var flash = require('connect-flash');
var mongo = require('mongodb');
var mongoose = require('mongoose');
var db = mongoose.connection;
var index = require('./routes/index');
var users = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(multer({
dest: './uploads'
}));
// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: false
}));
app.use(session({
secret: 'secret',
resave: true,
saveUninitialized: true
}));
app.use(passport.initialize());
app.use(passport.session());
app.use(expressValidator({
errorFormatter: function(param, msg, value) {
var namespace = param.split('.'),
root = namespace.shift(),
formParam = root;
while (namespace.length) {
formParam += '[' + namespace.shift() + ']';
}
return {
param: formParam,
msg: msg,
value: value
};
}
}));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(flash());
app.use(function(req, res, next) {
res.locals.messages = require('express-messages')(req, res);
next();
});
app.use('/', index);
app.use('/users', users);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// 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');
});
module.exports = app;
在控制台上我得到了以下输出，
TypeError: app.use() requires middleware functions at Function.use (C:\Users\Rohit Jain\Desktop\nodjs\userloginsystem\node_modules\express\lib\application.js:210:11) at Object. (C:\Users\Rohit Jain\Desktop\nodjs\userloginsystem\app.js:27:5) at Module._compile (module.js:571:32) at Object.Module._extensions..js (module.js:580:10) at Module.load (module.js:488:32) at tryModuleLoad (module.js:447:12) at Function.Module._load (module.js:439:3) at Module.require (module.js:498:17) at require (internal/module.js:20:19) at Object. (C:\Users\Rohit Jain\Desktop\nodjs\userloginsystem\bin\www:7:11) at Module._compile (module.js:571:32) at Object.Module._extensions..js (module.js:580:10) at Module.load (module.js:488:32) at tryModuleLoad (module.js:447:12) at Function.Module._load (module.js:439:3) at Module.runMain (module.js:605:10) at run (bootstrap_node.js:425:7) at startup (bootstrap_node.js:146:9) at bootstrap_node.js:540:3
请帮我解决此问题。
答案 0 :(得分：0)