A ruby on rails developer will know only too well. Clearly, JS is used to make it more attractive web browsing. It is therefore used in conjunction with the HTML pages. Its main function will be to boost the best HTML pages and incrustera directly into a web page. It is a client-side programming language which therefore run without launching software. With JS, so it will be possible to display or hide a text, scrolling through images, create a slide show with a good overview images and the creation of tooltips. Without JS, web pages therefore appear as mere book pages.
The JS span is such that the same excitement of its use is such that you can even quantify it. It must be said that webmasters are always trying to best boost their pages and JS is the best way. In addition, with the advent of Web 2.0, JS has further evolved even more with even more features. This is exactly the case of jQuery which is therefore a JS framework. With him, it will be possible to write less code while being more productive. JQuery is clearly a single JS file that is downloaded from the net. He has the extension ".js". This is a huge library of functions that have been written and compiled into one file while being as practical as possible in the process.