前端之nodejs聊天室

1.npm install –save express@4.15.2 安装express依赖
2.npm install –save socket.io 安装socket 依赖

以下为主要代码：

**app.js**var app = require('express')();var http = require('http').Server(app);var io = require('socket.io')(http);app.get('/', function(req, res){  res.sendFile(__dirname + '/index.html');});io.on('connection', function(socket){  console.log('a user connected');});http.listen(3000, function(){  console.log('listening on 127.0.0.1:3000');});**index.html**<script src="/socket.io/socket.io.js"></script><script>  var socket = io();</script>