socket.io连接事件不起作用，为什么？

Question

I am new to nodejs and express and trying the socket.io just a simple chat application. Its very simple code everything is just fine but there is no event fired logs on the node console. Connection event code is not working.

app.js

var express = require('express'),
    app = require('express')(),
    http = require('http').Server(app),
    io = require('socket.io')(http),
    start = require('./routes/index.js');

app.use('/', start);

io.on('connection', function(socket){
    console.log('a user connected');
        socket.on('disconnect', function(){
        console.log('user disconnected');
    });
});

var server = app.listen(3000, function () {
    var host = server.address().address;
    var port = server.address().port;
});

module.exports = app;

layout.jade

doctype html
html(lang="en")
head
    script(type="text/javascript" src="https://cdn.socket.io/socket.io-1.4.3.js")
    script.
        var socket = io();

body
    block content

Answer 1

Try listening on http instead of app . Like this:

var server = http.listen(3000, function () {
...