javascript is a language become more essential than ever on the web. Flexible and easy to understand, it is also a language particularly misunderstood, because many developers believe they can abstain from his apprenticeship before using it on their pages. That's why this course attempts to present the basics of javascript. Through the learning of its main components, you will discover how to integrate your scripts into a webpage and how the code can interact with your documents according to user actions. As the examples, you will see how this unusual language, while respecting the commonly accepted good practice.