Javascript 使用带有Express和Node.js的路由器

我是Node.js的新手。我从示例中提取了一些代码，但不知何故我破坏了一些东西：）

此时，在我的app.js文件中，我有一行代码，我认为它将Express与Node.js连接起来。这条线是这样的：

---

app.js

var routes = require('./routes/index');
// ...
app.get('/', routes.router);

var express = require('express');
var router = express.Router();

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router;

var routes = require('./routes/index');
//var routes = require('./routes') --> this works 
// ...
app.use('/', routes); //Using the router instance as a middleware , relative to '/'

var express = require('express');
var router = express.Router(); // new instance of Router

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router; // You export the intance

var routes = require('./routes')
app
 .use("/user",routes.user)
 .use("/other",routes.other)

module.exports = {
  user : require(./user),
  other : require(./other)
}

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /user
})
.post("/",function (req,res){
  //POST /user
})

module.exports = router;

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /other
})
.post("/",function (req,res){
  //POST /other
})

module.exports = router;

然后，在./routes/index.js中，我有以下内容：

routes/index.js

var routes = require('./routes/index');
// ...
app.get('/', routes.router);

var express = require('express');
var router = express.Router();

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router;

var routes = require('./routes/index');
//var routes = require('./routes') --> this works 
// ...
app.use('/', routes); //Using the router instance as a middleware , relative to '/'

var express = require('express');
var router = express.Router(); // new instance of Router

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router; // You export the intance

var routes = require('./routes')
app
 .use("/user",routes.user)
 .use("/other",routes.other)

module.exports = {
  user : require(./user),
  other : require(./other)
}

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /user
})
.post("/",function (req,res){
  //POST /user
})

module.exports = router;

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /other
})
.post("/",function (req,res){
  //POST /other
})

module.exports = router;

当我运行此操作时，会出现以下错误：

Error: Route.get() requires callback functions but got a [object Undefined]
    at Route.(anonymous function) [as get]

我不明白。我做错了什么

---

谢谢

基本server.js的示例：

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

app.get('/', function(req, res) {
    res.sendfile(__dirname + '/client/views/index.html');
});

app.listen(3000, function() {
    console.log('Server running on localhost:3000');
});

相比较而言，我认为你需要听端口。另外，我认为你的res.send应该发送一个实际的文件

有关NodeJ的更多文档，请参见：

还发现了与此相关的问题：

---

app.js

var routes = require('./routes/index');
// ...
app.get('/', routes.router);

var express = require('express');
var router = express.Router();

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router;

var routes = require('./routes/index');
//var routes = require('./routes') --> this works 
// ...
app.use('/', routes); //Using the router instance as a middleware , relative to '/'

var express = require('express');
var router = express.Router(); // new instance of Router

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router; // You export the intance

var routes = require('./routes')
app
 .use("/user",routes.user)
 .use("/other",routes.other)

module.exports = {
  user : require(./user),
  other : require(./other)
}

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /user
})
.post("/",function (req,res){
  //POST /user
})

module.exports = router;

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /other
})
.post("/",function (req,res){
  //POST /other
})

module.exports = router;

routes/index.js

var routes = require('./routes/index');
// ...
app.get('/', routes.router);

var express = require('express');
var router = express.Router();

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router;

var routes = require('./routes/index');
//var routes = require('./routes') --> this works 
// ...
app.use('/', routes); //Using the router instance as a middleware , relative to '/'

var express = require('express');
var router = express.Router(); // new instance of Router

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router; // You export the intance

var routes = require('./routes')
app
 .use("/user",routes.user)
 .use("/other",routes.other)

module.exports = {
  user : require(./user),
  other : require(./other)
}

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /user
})
.post("/",function (req,res){
  //POST /user
})

module.exports = router;

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /other
})
.post("/",function (req,res){
  //POST /other
})

module.exports = router;

更新 如果需要多个路由文件

---

app.js

var routes = require('./routes/index');
// ...
app.get('/', routes.router);

var express = require('express');
var router = express.Router();

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router;

var routes = require('./routes/index');
//var routes = require('./routes') --> this works 
// ...
app.use('/', routes); //Using the router instance as a middleware , relative to '/'

var express = require('express');
var router = express.Router(); // new instance of Router

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router; // You export the intance

var routes = require('./routes')
app
 .use("/user",routes.user)
 .use("/other",routes.other)

module.exports = {
  user : require(./user),
  other : require(./other)
}

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /user
})
.post("/",function (req,res){
  //POST /user
})

module.exports = router;

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /other
})
.post("/",function (req,res){
  //POST /other
})

module.exports = router;

routes/index.js

var routes = require('./routes/index');
// ...
app.get('/', routes.router);

var express = require('express');
var router = express.Router();

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router;

var routes = require('./routes/index');
//var routes = require('./routes') --> this works 
// ...
app.use('/', routes); //Using the router instance as a middleware , relative to '/'

var express = require('express');
var router = express.Router(); // new instance of Router

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router; // You export the intance

var routes = require('./routes')
app
 .use("/user",routes.user)
 .use("/other",routes.other)

module.exports = {
  user : require(./user),
  other : require(./other)
}

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /user
})
.post("/",function (req,res){
  //POST /user
})

module.exports = router;

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /other
})
.post("/",function (req,res){
  //POST /other
})

module.exports = router;

路由/user.js

var routes = require('./routes/index');
// ...
app.get('/', routes.router);

var express = require('express');
var router = express.Router();

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router;

var routes = require('./routes/index');
//var routes = require('./routes') --> this works 
// ...
app.use('/', routes); //Using the router instance as a middleware , relative to '/'

var express = require('express');
var router = express.Router(); // new instance of Router

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router; // You export the intance

var routes = require('./routes')
app
 .use("/user",routes.user)
 .use("/other",routes.other)

module.exports = {
  user : require(./user),
  other : require(./other)
}

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /user
})
.post("/",function (req,res){
  //POST /user
})

module.exports = router;

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /other
})
.post("/",function (req,res){
  //POST /other
})

module.exports = router;

routes/other.js

var routes = require('./routes/index');
// ...
app.get('/', routes.router);

var express = require('express');
var router = express.Router();

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router;

var routes = require('./routes/index');
//var routes = require('./routes') --> this works 
// ...
app.use('/', routes); //Using the router instance as a middleware , relative to '/'

var express = require('express');
var router = express.Router(); // new instance of Router

/* GET home page */
router.get('/', function(req, res) {
    res.send('respond with a resource');
});
module.exports = router; // You export the intance

var routes = require('./routes')
app
 .use("/user",routes.user)
 .use("/other",routes.other)

module.exports = {
  user : require(./user),
  other : require(./other)
}

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /user
})
.post("/",function (req,res){
  //POST /user
})

module.exports = router;

var router = require("express").Router()

router.get("/",function (req,res){
  // GET /other
})
.post("/",function (req,res){
  //POST /other
})

module.exports = router;

---

可以有两个路由文件吗？例如

routes/users.js

和

routes/orders.js

？

users.js

文件中的路由将具有以

/users

开头的路由，

orders.js

中的路由将具有以

/users/{userId}/orders

开头的路由。这可能吗？当然，这是个好主意，你可以得到不同的路线，去编辑我的答案。