Introduction to Javascript

Javascript is a client side scripting language. It is a primary used language on the web. It is lightweight and interpreted language. Javascript has ability to change HTML content. Today all modern web browsers support javascript. 

Javascript is developed by Netscape Communication at 1995. Javascript was first known as liveScript and then it changed to Javascript, may be because of popularity of Java. 

Advantage of Javascript

It is client side scripting language. Javascript code runs by the user processer and thus it saves bandwidth interaction with server.

Javascript is easy to learn and it’s much look like English language. 

Javascript has plenty of predefined function, variable thus provides greater functionality to the user.

Using javascript you can create interactive web pages that catches attraction of site visitor.

It is fast because it runs on user system and its need not be process on web server.

Limitations of Javascript

Javascript code can be used by hackers to infect user's system, so it is security issue. Modern web browsers set some restriction but still, it’s not fully secure.

Using javascript, you can't work with files on server because it is a client side scripting language.

Javascript doesn't support multithreading.

Javscript depends on browser, so it is interpreted differently on different browsers.

All browsers has option to disable javascript, so user can disable javascript.