JavaScript overburden website

[matana]

What is JavaScript? What can a do with JavaScript? Some people say that JavaScript can overburden computers is it true, because my web team says that they should run a JavaScript to my site to make some good decorations and want my approval, I don 't know what to say?

[iceman1]

If are used for decoration certainly will loaded computers of visitors, otherwise it is not true, JavaScript is needed. No one site without JavaScript. JavaScript is

designed to add interactivity to HTML pages
lightweight programming scripting language
usually embedded directly into HTML pages
executed without preliminary compilation
for free, no need to purchasing a license

[marci]

This is everything that JavaScript can make:
1).JavaScript gives HTML designers a programming tool - HTML authors are normally not programmers, but JavaScript is a scripting language with a very simple syntax! Almost anyone can put small "snippets" of code into their HTML pages
2).JavaScript can put dynamic text into an HTML page - A JavaScript statement like this:

document.write("<h1>" + name + "</h1>")

can write a variable text into an HTML page
3).JavaScript can react to events - A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element
4).JavaScript can read and write HTML elements - A JavaScript can read and change the content of an HTML element
5).JavaScript can be used to validate data - A JavaScript can be used to validate form data before it is submitted to a server. This saves the server from extra processing
6).JavaScript can be used to detect the visitor's browser - A JavaScript can be used to detect the visitor's browser, and - depending on the browser - load another page specifically designed for that browser
7).JavaScript can be used to create cookies - A JavaScript can be used to store and retrieve information on the visitor's computer