What Is Java Script ?

What Java Script Can Do ?

1. User Interaction
2. Form Validation
3. Image Swaps/Rollovers

What Java Script Can’t Do

1. JavaScript cannot access Database(without AJAX).
2. JavaScript cannot access files on client machine.

JavaScript V/s Java

JavaScript and Java share two very similar names but they are completely different languages that have very few things in common.

1. Java was developed by Sun Microsystems and is a full fledged, standalone, object oriented language

   JavaScript was created by Netscape and is a scripting language which placed inside an HTML page and provides interactivity to the page.

2. Java is both a compiled as well as interpreted    language and JavaScript is purely an interpreted language.

3. Java runs inside JVM and JavaScript runs inside web browser.

4. Java is a strongly typed language as it is compulsory to declare every variable’s data type and JavaScript is a loosely typed language as we do not have declare data types of variables before using them.

5. Java has been designed with security as it’s top priority. Every thing in java runs under the control of JVM that handles execution of a Java code and JavaScript is a much less secure language.

JavaScript History

Developed By	Brendan Eich
Original Name	Mocha, LiveScript
Company	Netscape
Launching  Year	1996
First Version	1.0
Latest Version	1.8

JavaScript Embedding

JavaScript can be embedded in HTML page in 2 ways:

1. Locally
2. Externally