High Performance JavaScript

If you’re like most developers, you rely heavily on JavaScript to build interactive and quick-responding web applications. The problem is that all of those lines of JavaScript code can slow down your apps. This book reveals techniques and strategies to help you eliminate performance bottlenecks during development. You’ll learn how to improve execution time, downloading, interaction with the DOM, page life cycle, and more.

Yahoo! frontend engineer Nicholas C. Zakas and five other JavaScript experts — Ross Harmes, Julien Lecomte, Steven Levithan, Stoyan Stefanov, and Matt Sweeney — demonstrate optimal ways to load code onto a page, and offer programming tips to help your JavaScript run as efficiently and quickly as possible. You’ll learn the best practices to build and deploy your files to a production environment, and tools that can help you find problems once your site goes live.

• Identify problem code and use faster alternatives to accomplish the same task
• Improve scripts by learning how JavaScript stores and accesses data
• Implement JavaScript code so that it doesn’t slow down interaction with the DOM
• Use optimization techniques to improve runtime performance
• Learn ways to ensure the UI is responsive at all times
• Achieve faster client-server communication
• Use a build system to minify files, and HTTP compression to deliver them to the browser

如果您和大多数开发人员一样，那么您将在很大程度上依赖于JavaScript来构建交互式和快速响应的Web应用。问题是，所有这些代码行都会减慢你的应用程序的速度。本书介绍了帮助您消除开发过程中的性能瓶颈的技术和策略。您将学习如何改进执行时间、下载、与DOM的交互、页面生命周期等。

雅虎!前端工程师Nicholas C.Zakas和其他五位JavaScript专家Ross Harmes、Julien Lecomte、Steven Levithan、Stoyan Stefan ov和Matt Sweeney演示了将代码加载到页面上的最佳方法，并提供编程提示以帮助您的JavaScript尽可能高效地快速运行。您将学习构建文件并将其部署到生产环境的最佳实践，以及在站点上线后帮助您发现问题的工具。

• 识别问题代码并使用更快的替代方案来完成相同的任务
• 通过了解JavaScript存储和访问数据的方式来改进脚本
• 实现JavaScript代码，使其不会减慢与DOM的交互
• 使用优化技术提高运行时性能
• 了解确保用户界面始终响应的方法
• 实现更快的客户端-服务器通信
• 使用构建系统缩小文件，并使用HTTP压缩将它们传递到浏览器