npm install --save expressnpm install --save socket.io
服务器端代码：
var app = require(‘express‘)();var http = require(‘http‘).Server(app);var io = require(‘socket.io‘)(http);app.get(‘/‘, function(req, res){ ???res.send(‘<h1>Welcome Realtime Server</h1>‘);});io.on(‘connection‘, function(socket){ ???console.log(‘a user connected‘); ???socket.on("disconnect", function() { ???????console.log("a user go out"); ???}); ???socket.on("message", function(obj) { ???????io.emit("message", obj); ???});});http.listen(3000, function(){ ???console.log(‘listening on *:3000‘);});客户端代码
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Document</title> ???<script src="http://127.0.0.1:3000/socket.io/socket.io.js"></script></head><body> ???<ul id="message"></ul> ???<script> ???????socket = io.connect(‘ws://127.0.0.1:3000‘); ???????socket.emit("message", {"name" : navigator.userAgent, "msg" : "hello world"}); ???????socket.on("message", function(obj) { ???????????console.log(obj); ???????}); ???</script></body></html>NodeJS实现WebSocket
原文地址：http://www.cnblogs.com/white0710/p/7890891.html