Question

我收到了ReferenceError：未定义mongoose。我是节点的新手，请在下面的App.js代码如下所示。我无法通过谷歌提供的所有答案解决这个问题。

   var express = require('express');
 var app = require('mongoose');
 var path = require('path');
 var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser'); 
var bodyParser = require('body-parser');

 var index = require('./routes/index');
var users = require('./routes/users');
var app = express();
app.set('views', path.join(__dirname, 'views')); 
   app.set('view engine', 'jade');

 app.use(logger('dev'));
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({ extended: false }));
   app.use(cookieParser());
 app.use(express.static(path.join(__dirname, 'public')));

 app.use('/', index);
 app.use('/users', users);
 app.use(function(req, res, next) {
 var err = new Error('Not Found');
  err.status = 404;
  next(err);
  });

  mongoose.connect('mongodb://localhost:27017/mydb');

  var Schema = new mongoose.Schema({
  cr   : String,

        });

       var user = mongoose.model('myc', Schema);

    app.get('/view', function(req, res){
     user.find({}, function(err, docs){
      if(err) res.json(err);
    else    res.render('index', {users: docs});
      });
             });


      app.use(function(err, req, res, next) {

    res.locals.message = err.message;
     res.locals.error = req.app.get('env') === 'development' ? err : {};

    res.status(err.status || 500);
   res.render('error');
  });

 module.exports = app;

我使用的是node6.11.0和npm v 5.5.1 怎么解决这个？请求帮助

Answer 1

您需要安装mongoose作为依赖项

运行此命令，

$ npm install mongoose --save

也替换

var app = require('mongoose');

到

var mongoose = require('mongoose');

Answer 2

您需要确保安装了mongoose。尝试通过npm安装。

npm install mongoose --save

Answer 3

将var app = require('mongoose');替换为var mongoose = require('mongoose');。我想，你已经安装了猫鼬。如果没有，请使用命令npm i mongoose --save

进行安装

ReferenceError：未定义mongoose

3 个答案: