[英]Expressjs4 Routing Error
I am in the process of learning node and expressjs and have been running into a routing issue that I have been trying to debug. 我正在学习node和expressjs的过程中,一直遇到我一直试图调试的路由问题。 I believe that I am using the right properties and method calls, but for some reason it looks like my issue is either coming from when I create a new object from my blogModel module or when I call app.use("/", routes);
我相信我使用的是正确的属性和方法调用,但是由于某种原因,看来我的问题出在我通过blogModel模块创建新对象时还是在我调用app.use("/", routes);
in my server.js file. 在我的server.js文件中。
Error Message: 错误信息:
/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: 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: 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');
});
}
You forget to add the first parameter to routes function: 您忘记为路由功能添加第一个参数:
var routes = require('./app/routes.js')(router);
Need to be 需要
var routes = require('./app/routes.js')(app, router);
Have another look at the prototype of the function: 再看一下函数原型:
module.exports = function(app, router)...
First of all as @jonjon mentioned you only have one parameter ( router
) when you should have two parameters ( app
, router
) 首先,作为@jonjon提到你只有一个参数( router
)时,你应该有两个参数( app
, router
)
var routes = require('./app/routes.js')(app, router);
This reveals another issue though. 但这揭示了另一个问题。 In router.js
you are creating a new router but never telling your Express
app to use it. 在router.js
您正在创建一个新的路由器,但从未告诉Express
应用程序使用它。
module.exports = function(app, router) {
var express = require('express');
var router = express.Router();
Remedying this will require a little refactoring. 解决此问题将需要一些重构。
routes.js 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
Then in server.js you can: 然后在server.js中,您可以:
var routes = require('./routes');
app.use(routes);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.