Question

过去一小时我一直在盯着这段代码，我不知道如何解决这个问题，我得到了'TypeError: req.flash is not a function。我试过移动app.use(flash)，但我仍然收到错误。我该如何解决这个问题？

var flash = require('connect-flash');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var handlebars = require('express-handlebars').create({
      layoutsDir: path.join(__dirname, "views/layouts"),
      partialsDir: path.join(__dirname, "views/partials"),
      defaultLayout: 'layout',
      extname: 'handlebars'
});
var expressValidator = require('express-validator');
var session = require('express-session');
var passport = require('passport');
var localStrategy = require('passport-local').strategy;
var mongo = require('mongodb');
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/login');
var db = mongoose.connection;

// init app
var app = express();

var routes = require('./routes/index');
var users = require('./routes/users');

// view engine
app.engine('handlebars', handlebars.engine);
app.set('view engine', 'handlebars');
app.set('views', path.join(__dirname, "views"));

app.use(expressValidator());

// bodyParser Middleware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());

// set static folder
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', routes);
app.use('/users', users);

app.use(flash);

// express session
app.use(session({
    secret: 'secret',
    saveUninitialized: true,
    resave: true
}));

// passport init
app.use(passport.initialize());
app.use(passport.session());

// Global Vars
app.use(function (req, res, next) {
    res.local.success_msg = req.flash('success_msg');
    res.local.error_msg = req.flash('error_msg');
    res.local.error = req.flash('error');
    next();
});

// set Port
app.set('port', (process.env.PORT || 3000));
app.listen(app.get('port'), function () {
    console.log('Server started on port ' + app.get('port'));
});

Answer 1

每the documentation，请更改：

app.use(flash);

到此：

app.use(flash());

并且，将您的app.use(flash())移到您的其他路线定义之前，但是在您的会话定义之后。

Answer 2

您使用<Expander Header="Handle" FontSize="15" BorderBrush="Black" Margin="3,0,2,1"> <Menu Background="White"> <VirtualizingStackPanel Orientation="Vertical"> <MenuItem x:Name="MenuArticle" Header="Article" Height="25" FontSize="13" Width="177" Click="MenuArticle_Click"> <MenuItem x:Name="menuNewArticle" Header="New article" Height="25" FontSize="13" Width="187"/> <MenuItem x:Name="menuHandleArticle" Header="Handle article" Height="25" FontSize="13" Width="187"/> </VirtualizingStackPanel> </Menu> </Expander>设置的中间件按照其声明的顺序执行，因此在您的情况下，将在会话处理之前调用Flash模块。快速浏览一下connect-flash-docs会发现在设置其他与会话相关的中间件后应该调用app.use()，所以请尝试将其移到某些行，这样可以解决您的问题。

来自connect-flash-docs的引用：

Flash消息存储在会话中。首先，通过启用cookieParser和会话中间件来照常设置会话。然后，使用connect-flash提供的flash中间件。

req.flash不是函数Nodejs

2 个答案: