javascript - 将路由器与 Express 和 Node.js 结合使用

Question

我是 Node.js 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，我认为有一行将 Express 与 Node.js 连接起来。该行看起来像这样:

app.js

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

然后，在 ./routes/index.js 中我有以下内容:

routes/index.js

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;

当我运行此程序时，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!

Answer 1

app.js

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

routes/index.js

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

更新如果您想要超过 1 个路由文件

app.js

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

routes/index.js

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

routes/user.js

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

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

module.exports = router;

routes/other.js

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

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

module.exports = router;