[英]Expressjs4 Routing Error
我正在學習node和expressjs的過程中,一直遇到我一直試圖調試的路由問題。 我相信我使用的是正確的屬性和方法調用,但是由於某種原因,看來我的問題出在我通過blogModel模塊創建新對象時還是在我調用app.use("/", routes);
在我的server.js文件中。
錯誤信息:
/Users/user/Desktop/Projects/node/blog/node_modules/express/lib/router/index.js:423
throw new TypeError(msg);
^
TypeError: Router.use() requires callback function but got a [object Undefined]
at /Users/user/Desktop/Projects/node/blog/node_modules/express/lib/router/index.js:423:13
at Array.forEach (native)
at Function.use (/Users/user/Desktop/Projects/node/blog/node_modules/express/lib/router/index.js:419:13)
at /Users/user/Desktop/Projects/node/blog/node_modules/express/lib/application.js:178:21
at Array.forEach (native)
at Function.use (/Users/user/Desktop/Projects/node/blog/node_modules/express/lib/application.js:175:7)
at Object.<anonymous> (/Users/user/Desktop/Projects/node/blog/server.js:28:5)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
26 Aug 08:18:05 - [nodemon] app crashed - waiting for file changes before starting...
server.js:
//Load express
var express = require('express');
var app = express();
var router = express.Router(); // get an instance of the router
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var routes = require('./app/routes.js')(router);
// configure app to use bodyParser()
// get data from a POST method
app.use(bodyParser.urlencoded({ extended: true}));
app.use(bodyParser.json());
var port = process.env.PORT || 8080; // set the port
var blogDB = require('./config/blogDB.js');
var Blogpost = require('./app/models/blogModel');
app.set('view engine', 'ejs'); // set ejs as the view engine
app.use(express.static(__dirname + '/public')); // set the public directory
// use routes.js
app.use('/', routes);
app.listen(port);
console.log('magic is happening on port' + port);
routes.js:
module.exports = function(app, router) {
var express = require('express');
var router = express.Router();
var blogDB = require('../config/blogDB.js');
//index
router.route('/', function(req, res) {
var drinks = [
{ name: 'Bloody Mary', drunkness: 3 },
{ name: 'Martini', drunkness: 5 },
{ name: 'Scotch', drunkness: 10 }
];
var tagline = "Lets do this.";
res.render('pages/index', {
drinks: drinks,
tagline: tagline
});
});
//blog
router.route('/blog')
.post(function(req, res) {
var blogpost = new Blogpost(); // create a new instance of a Blogpost model
blogpost.title = req.body.name; // set the blog title
blogpost.body = req.body.body; // set the blog content
blogpost.save(function(err) {
if (err)
res.send(err);
res.json({ message: 'Blog created.' });
});
});
//about
router.get('/about', function(req, res) {
res.render('pages/about');
});
}
您忘記為路由功能添加第一個參數:
var routes = require('./app/routes.js')(router);
需要
var routes = require('./app/routes.js')(app, router);
再看一下函數原型:
module.exports = function(app, router)...
首先,作為@jonjon提到你只有一個參數( router
)時,你應該有兩個參數( app
, router
)
var routes = require('./app/routes.js')(app, router);
但這揭示了另一個問題。 在router.js
您正在創建一個新的路由器,但從未告訴Express
應用程序使用它。
module.exports = function(app, router) {
var express = require('express');
var router = express.Router();
解決此問題將需要一些重構。
routes.js
var express = require('express');
var router = express.Router();
var blogDB = require('../config/blogDB.js');
//index
router.route('/')
.get(function(req, res) {
/* ... */
});
router.route('/blog')
.post(function(req, res) {
/* ... */
});
router.get('/about', function(req, res) {
/* ... */
});
module.exports = router; // This is the important part
然后在server.js中,您可以:
var routes = require('./routes');
app.use(routes);
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