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JavaScript Origins

JavaScript was released by Netscape and Sun Microsystems in 1995.
However, JavaScript is not the same thing as Java.
JavaScript is the most popular scripting language on the internet, and works in all major browsers, such as Internet Explorer, Firefox, Chrome, Opera, and Safari.

What is JavaScript?

• JavaScript was designed to add interactivity to HTML pages
• JavaScript is a scripting language
• A scripting language is a lightweight programming language
• JavaScript is usually embedded directly into HTML pages
• JavaScript is an interpreted language (means that scripts execute without preliminary compilation)
• Everyone can use JavaScript without purchasing a license

Uses of JavaScript

• Use it to add multimedia elements
With JavaScript you can show, hide, change, resize images, and
create image rollovers. You can create scrolling text across the status
bar.

• Create pages dynamically
Based on the user's choices, the date, or other external data, JavaScript
can produce pages that are customized to the user.

• Interact with the user
It can do some processing of forms and can validate user input when
the user submits the form.

How is JavaScript constructed

The basic part of a script is a variable, literal or object. A variable is a word that represents a piece of text, a number, a boolean true or false value or an object. A literal is the actual number or piece of text or boolean value that the variable represents. An object is a collection of variables held together by a parent variable, or a document component.