Whether you need an example-driven programmer's guide or a complete desk reference Java Script: The Definitive Guide is the most authoritative book on the language that runs the Web. The sixth edition offers comprehensive coverage of ECMAScript 5 (the new language standard) & also the new APIs introduced in HTML5. The chapters on functions & classes have been completely rewritten & updated to match current best practices. A new chapter covers language extensions & subsets. Java Script: The Definitive Guide is organized into four sections: * Part 1: Learn the core Java Script language in detail -- ideal for newcomers as well as experienced Java Script programmers who want to sharpen their skills * Part 2: Understand the scripting environment provided by web browsers with broad & deep coverage of client-side Java Script illustrated by many sophisticated examples * Part 3: Get a complete reference for core Java Script that documents every class object constructor method function property & constant * Part 4: Consult a separate reference to client-side Java Script including legacy web browser APIs the standard Level 2 DOM API the XMLHttp Request object & the canvas tag