Nodejs / Express - 启动我的应用程序：不推荐使用express.createServer（）

Question

我下载了一个节点应用程序来测试和玩。 我用Google搜索，发现Express有点过时了。 有人可以帮我修复实现的代码吗？

这是代码

/**
 * Module dependencies.
 */

// base dependencies for app
var express = require('express')
  , routes = require('./routes')
  , DB = require('./accessDB').AccessDB
  , passport = require('passport')
  , mongoose = require('mongoose')
  , mongoStore = require('connect-mongodb');

var app = module.exports = express.createServer();
global.app = app;

var DB = require('./accessDB');
var conn = 'mongodb://localhost/CrowdNotes';
var db;

// SocketIO Configuration
//var io = require('socket.io').listen(app);
//
//io.sockets.on('connection', function(socket) {
//  socket.on('user note', function (note) {
//    console.log(note);
//  });
//});

// Configuration
app.configure(function(){
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.cookieParser());
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(require('stylus').middleware({ src: __dirname + '/public' }));
  app.use(express.session({ 
    store: mongoStore(conn)
  , secret: 'applecake'
  }, function() {
    app.use(app.router);
  }));
  app.use(passport.initialize());
  app.use(passport.session());
  app.use(express.static(__dirname + '/public'));
});

db = new DB.startup(conn);

app.configure('development', function(){
  app.use(express.errorHandler({ dumpExceptions: true, showStack: true })); 
});

app.configure('production', function(){
  app.use(express.errorHandler()); 
});

// Routes
require('./routes')(app);

app.listen(3000);
console.log("Express server listening on port %d in %s mode", app.address().port, app.settings.env);

这是我通过node app运行应用程序后收到的错误

C:\CrowdNotes>node app
Warning: express.createServer() is deprecated, express
applications no longer inherit from http.Server,
please use:

  var express = require("express");
  var app = express();


C:\CrowdNotes\app.js:63
console.log("Express server listening on port %d in %s mode", app.address().po
                                                                  ^
TypeError: Object function app(req, res){ app.handle(req, res); } has no method
'address'
    at Object.<anonymous> (C:\CrowdNotes\app.js:63:67)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.runMain (module.js:492:10)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)

C:\CrowdNotes>

固定。

我现在正在注册，并使用我的新“用户”数据登录并收到此错误：

ReferenceError: C:\CrowdNotes\views\account.jade:6
    4|   div#header 
    5|     h2 CrowdNotes
  > 6|     p Hi, #{currentUser.name.first}! 
    7| 
    8|   - if (myEvent)
    9|     p.center My Event: #{myEvent.name} 

currentUser is not defined
    at eval (eval at <anonymous> (C:\CrowdNotes\node_modules\jade\lib\jade.js:176:8))
    at exports.compile (C:\CrowdNotes\node_modules\jade\lib\jade.js:181:12)
    at Object.exports.render (C:\CrowdNotes\node_modules\jade\lib\jade.js:216:14)
    at View.exports.renderFile [as engine] (C:\CrowdNotes\node_modules\jade\lib\jade.js:243:13)
    at View.render (C:\CrowdNotes\node_modules\express\lib\view.js:75:8)
    at Function.app.render (C:\CrowdNotes\node_modules\express\lib\application.js:500:10)
    at ServerResponse.res.render (C:\CrowdNotes\node_modules\express\lib\response.js:716:7)
    at module.exports.getAccount (C:\CrowdNotes\routes\index.js:47:11)
    at Promise.module.exports.getMyEvent (C:\CrowdNotes\accessDB.js:54:7)
    at Promise.addBack (C:\CrowdNotes\node_modules\mongoose\lib\promise.js:128:8)

我想知道这是否也是某种形式的语法错误？ 不知道这里出了什么问题因为我认为代码全部排成一行。

我正在使用此处的代码： https ： //github.com/rockbot/crowdnotes

Answer 1

解决方案在错误中给出。

警告：不推荐使用express.createServer（），快递应用程序不再继承自http.Server请使用：

  var express = require("express");
  var app = express();

所以你必须这样做。

var express = require('express')
  , http = require('http');

var app = express(); 
var server = http.createServer(app);

Answer 2

它可以通过这个简单的程序完成：

var express = require('express');
var app = express();
app.get('/',
    function(req,res)
    {
        res.send("express");
    }
);
app.listen(3333);

它工作正常。

Answer 3

另一个可能的解决方案是将express 2.5.8作为依赖项安装。

添加到package.json：

    {
    "name": "authentication"
  , "version": "0.0.1"
  , "private": true
  , "dependencies": {
      "express": "2.5.8"
    , "jade": ">= 0.26.1"
  }
}

然后跑

npm install

Answer 4

var express = require('express');
var app = express();
app.listen(your_port_number);

随着express（express 4.x）的更新发布，您不需要创建服务器。 app.listen在内部做到这一点。 请参阅https://expressjs.com/en/4x/api.html#app.listen

Answer 5

我已经在使用以下代码片段，它工作正常：

var express =require("express");
var http = require("http");

var app = express();
//app routers here 
...
var httpServer = http.Server(app);

httpServer.listen({PORT}, function(err){

});