Everyone that wants to program JavaScript should at least try reading the following section. If you have trouble understanding it, don't worry. The best way to learn JavaScript is from the examples presented in this tutorial. After you have been through the lessons, come back to this page and read it again.

OOP is a programming technique (note: not a language structure - you don't even need an object-oriented language to program in an object-oriented fashion) designed to simplify complicated programming concepts. In essence, object-oriented programming revolves around the idea of user- and system-defined chunks of data, and controlled means of accessing and modifying those chunks.

A variable is a "container" for information you want to store. A variable's value can change during the script. You can refer to a variable by name to see its value or to change its value.
Rules for variable names:

• Variable names are case sensitive


• They must begin with a letter or the underscore character

As great as it is, JavaScript is probably one of the most commonly abused and overused technologies in web development. In this article, I hope to help you implement JavaScript without tears and guide you in the basics of good scripting practices.
The key point to get across when discussing accessible JavaScripting is that it is always the JavaScript that makes your documents inaccessible to begin with. I know that might sound strange, but it'll soon start to make sense. An unlimited number of sites have very serious accessibility problems caused because they didn't account for the large number of users who have JavaScript disabled in their web browsers.

This is a very simple script. It opens up an alert message box which displays whatever is typed in the form box below.

Type something in the box. Then click "Show Me"

The most common way to assign a value to a variable is using the equals sign.

Consider these examples to see the different ways variables can be assigned to contain either values or text.
Note in particular how parentheses can be used to control how complex formulas are handled.