你如何在同一个端口上运行express和socket.io

Question

its always annoying i have to always run listen to a new port in my app.js meaning eg i can access my website with localhost:3000 and localhost:4000 and socket.io on my site works only using localhost:4000. I just pushed it to heroku and realised i cant even change the port on heroku

this is what i have

app.js:

var express = require("express");
var io = require('socket.io')
var port = 3000;

var app = express()
  , server = require('http').createServer(app)
  , io = io.listen(server);

server.listen(3000);

module.exports = io;

client.js:

var socket = io('http://localhost/');

Answer 1

I'm able to do what you want with:

var exp = express();
var server = require('http').Server(exp)
var io = require('socket.io')(server);

//setup stuff

server.listen(3000)

Answer 2

The simplest version of express 4 + socket.io 1.0 (which I use myself) is this:

var express = require('express');
var app = express();
var server = app.listen(3000, function() {
    console.log("server started on port 3000");
});

var io = require('socket.io').listen(server);

I don't honestly know why your version doesn't work, but have advised several people to follow this sequence (which I got from the documentation) and it has worked for myself and for them. It probably has to do with io getting plugged into express 4 appropriately and not using the general http module, but express instead.