Read the Introduction and Chapters 1 and 2 of Professional JavaScript for Web Developers.
Very Important: Every example code you encounter in the book, type it out and test it and tweak it (experiment with it) in Firefox’s or Chrome’s browser console. Or use JSFiddle. Don’t use Safari. I recommend Firefox—add the Firebug Add on to firefox and use it for testing and debugging your code. The browser console is an area of the browser where you can write and run JavaScript code.
And JSFiddle is a web application that allows you to write and test your code online, right in your browser. You can test all sorts of code, including a combination of HTML, CSS, and JavaScript (and jQuery).
Work through the Introduction to JavaScript section of the JavaScript Track on Codecademy.
Preface and Chapters 3 and 4 of Professional JavaScript for Web Developers. You can skip the section on “Bitwise Operators”; it is hardly likely you will use those in your JavaScript career. And again, make sure you stop and write the example code in your browser’s console (or JSFiddle) and experiment—change some of the variables and tweak the code a bit.
And work through sections 2 to 5 of the JavaScript Track on Codecademy.

	Creado por Bruno de angeli hace alrededor de 10 años

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