Install Node.js2016/06/15

	Install ServerSide JavaScript Environment "Node.js".
[1]	Install Node.js 4.x (LTS).

root@www:~#

curl -O https://deb.nodesource.com/setup_4.x

root@www:~#

sh setup_4.x

root@www:~#

apt-get -y install nodejs

root@www:~#

node -v

v4.4.5

[2]	Create a test tool. It's possible to do it as a common user.

ubuntu@www:~$

vi helloworld.js

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(1337, '127.0.0.1');
console.log('listening on http://127.0.0.1:1337/');

# run server

ubuntu@www:~$

node helloworld.js &

# verify (it's OK if following reply is back )

ubuntu@www:~$

curl http://127.0.0.1:1337/

Hello World

[3]	Install Socket.IO and create a test apprication with using WebSocket.

ubuntu@www:~$

npm install socket.io express

ubuntu@www:~$

vi chat.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){
  socket.on('chat message', function(msg){
    io.emit('chat message', msg);
  });
});

http.listen(1337, function(){
  console.log('listening on *:1337');
});

ubuntu@www:~$

vi index.html

<!DOCTYPE html>
<html>
<head>
<title>WebSocket Chat</title>
</head>
<body>
<form action="">
<input id="sendmsg" autocomplete="off" /><button>Send</button>
</form>
<ul id="messages" style="list-style-type: decimal; font-size: 16px; font-family: Arial;"></ul>
<script src="/socket.io/socket.io.js"></script>
<script src="http://code.jquery.com/jquery.min.js"></script>
<script>
  var socket = io();
  $('form').submit(function(){
    socket.emit('chat message', $('#sendmsg').val());
    $('#sendmsg').val('');
    return false;
  });
  socket.on('chat message', function(msg){
    $('#messages').append($('<li style="margin-bottom: 5px;">').text(msg));
  });
</script>
</body>
</html>

ubuntu@www:~$

node chat.js

listening on *:1337

Access to "http://(server's hostname or IP address):1337/" from a Client computer to make sure sample app works normally.

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