client

hello.js

$(function(){
    var socket = io.connect('http://localhost/');
    socket.on('hello', function(message){
        $('body').append('<p>'+message+'</p>');
    });
    $('body').append('<button id="send">全員に送る</button>');
    $('#send').click(function(e){
        socket.emit('message', 'hello!! '+new Date().toLocaleString());
    });
});