Javascript 节点体系结构的正确格式（基本）

导言

我在Node中构建了一些后端功能（第一次使用Node）。问题是整个东西都是在一个页面（index.js）中构建的，所以现在我要学习一些基本教程，并介绍express router中间件，现在尝试采用模块化MVC方法

这段代码很简单，但当我把它分成两个页面时，它就停止了运行

Server.js

和

config.js

。我知道这是个简单的问题，但我看不出来。有人能帮你发现问题并改进结构吗

问题

我去

http://localhost:8080/about

或者另一条路线

不能走动

而不是正确的打印输出

后端/server.js

var express = require('express');
var app     = express();
var port    =   process.env.PORT || 8080;

// get an instance of router
var router = express.Router();

// START THE SERVER
// ==============================================
app.listen(port);
console.log('Server has started!! ' + port);

router.use(function(req, res, next) {

    console.log(req.method, req.url);

    next();
});

router.get('/', function(req, res) {
    res.send('im the home page!');
});

// sample route with a route the way we're used to seeing it
router.get('/sample', function(req, res) {
    res.send('this is a sample!');
});


router.get('/about', function(req, res) {
    res.send('im the about page!');
});


app.route('/login')

    .get(function(req, res) {
        res.send('this is the login form');
    })

    .post(function(req, res) {
        console.log('processing'); // shows on console when post is made
        res.send('processing the login form!'); // output on postman
    });

app.use('/', router);

module.exports = function(router) {

    // set up your router here with router.use, etc.

};

var configure = require('./config');

// after you set up your express router...
configure(router);

// now start listening

后端/config.js

var express = require('express');
var app     = express();
var port    =   process.env.PORT || 8080;

// get an instance of router
var router = express.Router();

// START THE SERVER
// ==============================================
app.listen(port);
console.log('Server has started!! ' + port);

router.use(function(req, res, next) {

    console.log(req.method, req.url);

    next();
});

router.get('/', function(req, res) {
    res.send('im the home page!');
});

// sample route with a route the way we're used to seeing it
router.get('/sample', function(req, res) {
    res.send('this is a sample!');
});


router.get('/about', function(req, res) {
    res.send('im the about page!');
});


app.route('/login')

    .get(function(req, res) {
        res.send('this is the login form');
    })

    .post(function(req, res) {
        console.log('processing'); // shows on console when post is made
        res.send('processing the login form!'); // output on postman
    });

app.use('/', router);

module.exports = function(router) {

    // set up your router here with router.use, etc.

};

var configure = require('./config');

// after you set up your express router...
configure(router);

// now start listening

---

正如@SLaks在他的评论中所说，您需要导入（

require

）您的

backend/config.js

文件。但事情并没有那么简单

在node中，变量的作用域是它们出现的文件，因此如果您只需将

require（'./config'）

添加到

server.js

文件中，这也不会起作用，因为

config.js

中的

router

变量是该文件的本地变量-它不会知道

server.js中的
router
变量

解决这个问题的方法是让
config.js
文件导出一个函数，
server.js
文件可以用来配置东西。比如说

config.js

var express = require('express');
var app     = express();
var port    =   process.env.PORT || 8080;

// get an instance of router
var router = express.Router();

// START THE SERVER
// ==============================================
app.listen(port);
console.log('Server has started!! ' + port);

router.use(function(req, res, next) {

    console.log(req.method, req.url);

    next();
});

router.get('/', function(req, res) {
    res.send('im the home page!');
});

// sample route with a route the way we're used to seeing it
router.get('/sample', function(req, res) {
    res.send('this is a sample!');
});


router.get('/about', function(req, res) {
    res.send('im the about page!');
});


app.route('/login')

    .get(function(req, res) {
        res.send('this is the login form');
    })

    .post(function(req, res) {
        console.log('processing'); // shows on console when post is made
        res.send('processing the login form!'); // output on postman
    });

app.use('/', router);

module.exports = function(router) {

    // set up your router here with router.use, etc.

};

var configure = require('./config');

// after you set up your express router...
configure(router);

// now start listening

server.js

var express = require('express');
var app     = express();
var port    =   process.env.PORT || 8080;

// get an instance of router
var router = express.Router();

// START THE SERVER
// ==============================================
app.listen(port);
console.log('Server has started!! ' + port);

router.use(function(req, res, next) {

    console.log(req.method, req.url);

    next();
});

router.get('/', function(req, res) {
    res.send('im the home page!');
});

// sample route with a route the way we're used to seeing it
router.get('/sample', function(req, res) {
    res.send('this is a sample!');
});


router.get('/about', function(req, res) {
    res.send('im the about page!');
});


app.route('/login')

    .get(function(req, res) {
        res.send('this is the login form');
    })

    .post(function(req, res) {
        console.log('processing'); // shows on console when post is made
        res.send('processing the login form!'); // output on postman
    });

app.use('/', router);

module.exports = function(router) {

    // set up your router here with router.use, etc.

};

var configure = require('./config');

// after you set up your express router...
configure(router);

// now start listening

您从未实际运行过第二个文件。如何运行第二个文件，是否包括在第一个文件中？像
include（'back-end/config.js'）