问题：
So here is the deal: I'm trying to use socket.io in an express project.所以这就是交易：我正在尝试在一个快速项目中使用 socket.io。 After Express Js 4 was lauched, i've updated my express-generator and now the app initial functions goes into ./bin/www file, including those vars (www file contents: http://jsfiddle.net/avMa5/ ) Express Js 4 发布后，我更新了我的 express-generator，现在应用程序初始功能进入./bin/www文件，包括那些变量（www 文件内容： http : //jsfiddle.net/avMa5/ ）
var server = app.listen(app.get('port'), function() {..}
(check it by npm install -g express-generator and then express myApp （通过npm install -g express-generator ，然后express myApp
that being said, let's remember how socket.io docs ask us to fire it:话虽如此，让我们记住 socket.io 文档如何要求我们触发它：
var app = require('express').createServer();
var io = require('socket.io')(app);
Ok but i can't do it inside app.js, like recommended.好的，但我不能在 app.js 中做到这一点，就像推荐的那样。 This should be done in ./bin/www in order to work.这应该在 ./bin/www 中完成才能工作。 in ./bin/www this is what i can do to get it working:在 ./bin/www 这是我可以做的让它工作：
var io = require('socket.io')(server)
Ok this works, but i can't use the io var anywhere else, and i really don't want to put my socket.io functions on www file.好的，这可行，但我不能在其他任何地方使用 io var，而且我真的不想将 socket.io 函数放在www文件中。
I guess this is just basic syntax, but I can't get this to work, not even using module.exports = server or server.exports = server nor module.exports.io = app(io) on www file我想这只是基本语法，但我无法module.exports = server工作，甚至不能在 www 文件上使用module.exports = server或server.exports = server或module.exports.io = app(io)
So the question is: how can i use socket.io having this /bin/www file as starting point of my app?所以问题是：我如何使用 socket.io 将此 /bin/www 文件作为我的应用程序的起点？