This book summarizes the typical applications of Ajax technology and basically covers the typical scenarios of AjaX technology application. There are a total of 45 examples in the book, divided into 9 chapters: dynamically loading data, improving user experience, e-commerce applications, server-side computing, web applications, automatic and scheduled services, server management, accessing third-party services and comprehensive projects. This book selects typical examples and explains in detail. By reading this book, readers can quickly master AjaX technology and apply it to actual projects.