JavaScript(JS) is one of the many object oriented programming languages currently present. This technology was developed in such a way that its code could be mixed with the HTML code and all its interactions with the screen and use could use this code. JavaScript is a scripting language, easy to learn, which nowadays supports the most popular search engines, ie Opera or Mozilla. However, it should be remembered that JavaScript should not be confused with Java – apart from the similarity of names, these languages do not have much in common.