说明：  本书中的章节是基于一个普通的JavaScript开发生命来组织的。 周期。在第1章中，这是用JavaScript加载的最佳方式。 页面。第2章到第8章着重于具体的编程技术 帮助您的JavaScript代码尽可能快地运行。第9章讨论了最佳方式。 将JavaScript文件构建并部署到生产环境，以及章节 10涵盖性能工具，可以帮助您识别代码后的其他问题 部署。
(The chapters in this book are organized based on a normal JavaScript development life cycle.This begins,in Chapter 1, with the most optimal ways to load JavaScript onto the page.Chapter 2 through Chapter 8 focus on specific programming techniques to help your JavaScript code run as quickly as possible.Chapter 9 discusses the best ways to build and deploy your JavaScript files to a production environment,and Chapter 10 covers performance tools that can help you identify further issues once the code is deployed.)