Basic Namespace Example in JavaScript. (FYI: This dates back to a Google+ Discussion from 2011)

Customer.js

"use strict";
var ACME = {};
ACME.Web = {};
ACME.Web.UI = {};

ACME.Web.UI.Customer = function () {
    var FirstName, LastName, FullName;

    FullName = function () {
        return this.FirstName + " " + this.LastName;
    }
    return {
        FirstName: FirstName,
        LastName: LastName,
        FullName: FullName
    };
};

// Test Method (where 'testScript' is an HTML Object such as a Button)
$("#testScript").click(function () {
    var customer = new ACME.Web.UI.Customer();

    customer.FirstName = "John";
    customer.LastName = "Smith";

    alert(customer.FullName());
});

Working Fiddle to Demo: http://jsfiddle.net/kdarty/F3gPZ/1/

Original Google+ Discussion: https://plus.google.com/+KevinDarty/posts/KkPCNTWeLX9