(This book describes JavaScript and related CSS, DOM, AJAX, jQuery and other technologies step by step. This book starts from the foundation of JavaScript language, discusses images, frames, browser windows, forms, regular expressions, user events and cookies, and adds two chapters to describe the basic knowledge of jQuery framework on the basis of the previous version This book not only introduces the basic knowledge and usage, but also deeply discusses the application examples of JavaScript.This book is suitable for beginners interested in web development and web design. It is also an ideal textbook for relevant courses in Colleges and universities.)