说明：  如果你使用JavaScript构建交互丰富的Web应用，那么JavaScript代码可能是造成你的Web应用速度变慢的主要原因。《高性能JavaScript》揭示的技术和策略能帮助你在开发过程中消除性能瓶颈。你将会了解如何提升各方面的性能，包括代码的加载、运行、DOM交互、页面生存周期等。雅虎的前端工程师Nicholas C. Zakas和其他五位JavaScript专家介绍了页面代码加载的最佳方法和编程技巧，来帮助你编写更为高效和快速的代码。你还会了解到构建和部署文件到生产环境的最佳实践，以及有助于定位线上问题的工具。
(The main reason for the slow speed of Web application. The techniques and strategies revealed in high performance JavaScript can help you eliminate performance bottlenecks during the development process. You will know how to improve the performance of all aspects, including code loading, running, DOM interaction, page lifecycle, and so on. YAHOO front-end Engineer Nicholas C. Zakas and five other JavaScript experts have introduced the best way and programming skills of page code loading to help you write more efficient and fast code. You will also understand the best practices for building and deploying files to the production environment, and tools that help locate online problems.)