Stoyan Stefanov 
JavaScript for PHP Developers [PDF ebook] 
A Concise Guide to Mastering JavaScript

If you want to significantly expand your web development skills beyond PHP, this practical, hands-on book teaches you ECMAScriptthe core Java Script languagefrom the ground up. Youll discover some similarities between Java Script and PHP, such as conditions and loops, but the primary focus is on Java Scripts unique object creation, classes, prototypes, and inheritance.Java Script knowledge is essential for working with todays Web, whether youre building applications for the client, the server, or for mobile useand your PHP experience gives you a head start. This book will help you become fluent with Java Script quickly, and then serve as a handy reference once you start coding.Explore Java Script syntax, including variables, arrays, loops, and conditions Learn how functions are important in Java Scriptand why theyre actually objects Delve into Java Scripts object-oriented features, including prototypes, code reuse, and inheritance Examine the built-in API and explore its global functions, properties, and objects Learn about updates in ECMAScript5, the latest version of the standard Use common design patterns to organize your code in large applications