Quick launch an web server base on expressjsupdate add support CORS

app.js

/**
 *  Tutorial
 *
 *  Step1. install nodejs & npm (download: http://nodejs.org/download/)
 *
 *  Step2. install express (http://expressjs.com/)
 *         $ sudo npm install express -g
 *
 *  Step3. $ node app
 *         default port is 3000
 *         default root is this file(app.js) path
 *
 *         if you want to change port or root folder you can follow this format
 *         $ node app [YOUR_PORT] [YOUR_ROOT (base on app.js file path)] or
 *         $ node app [YOUR_ROOT (base on app.js file path)] [YOUR_PORT]
 *
 *         SAMPLE: $ node app 8080 www
 *                 $ node app www 8080
 *         server will start on port 8080 and root folder is 'www'
 *
 *         SAMPLE2 $ node app 8080
 *         server will start on port 8080 and root folder is '/'
 *
 *         SAMPLE3 $ node app www
 *         server will start on port 3000 and root folder is 'www'
 */

var express = require('/usr/local/lib/node_modules/express'), //mac default npm path
    http = require('http'),
    path = require('path'),
    myFolder = '/',
    myDirectory = '',
    myPort = 3000;

if(process.argv.length > 2){
    if(!isNaN(process.argv[2])){
        myPort = process.argv[2];
    }else{
        myFolder = process.argv[2];
    }
}

if(process.argv.length > 3){
    if(!isNaN(process.argv[3])){
        myPort = process.argv[3];
    }else{
        myFolder = process.argv[3];
    }
}

myDirectory = (myFolder.match(/^(~\/|\/)/i)) ? myFolder : __dirname + '/' + myFolder;

var app = express();

app.configure(function(){
    app.set('port', process.env.PORT || myPort);
    app.use(express.favicon());
    app.use(express.logger('dev'));
    app.use(express.static(path.join(__dirname, myFolder)));
    app.use(express.directory(myDirectory));
});

app.configure('development', function(){
    app.use(express.errorHandler());
});

http.createServer(app).listen(app.get('port'), function(){
    var display = 'Express server listening on port ';
    display += app.get('port');
    display += ' root folder is "';
    display += myDirectory;
    display += '"';

    console.log(display);
});