Node.js实战：第16版全览与Web应用开发

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《Node.js实战（英文版）》是一本全面介绍Node.js编程的权威指南，由Manning Early Access Program出版，针对Node.js v16版本。本书版权属于Manning Publications，鼓励读者在官方论坛（http://www.manning-sandbox.com/forum.jspa?forumID=790）提出反馈和修正。作者是Roger Chen，电子邮箱为annie@geniachip.com。本书分为三个主要部分： **第一部分：Node基础知识** 1. **Chapter 1：欢迎来到Node.js** - 介绍了Node.js的核心概念，包括其非阻塞I/O模型和事件驱动的特点，为后续章节奠定基础。 2. **Chapter 2：构建多房间聊天应用** - 通过一个实例演示如何利用Node.js的实时通信能力开发网络应用。 3. **Chapter 3：Node编程基础** - 深入讲解Node.js的异步编程、模块系统以及文件系统操作等核心概念。 **第二部分：使用Node进行Web应用程序开发** 4. **Chapter 4：构建Node web应用** - 学习如何使用Node搭建HTTP服务器，处理HTTP请求。 5. **Chapter 5：存储Node应用数据** - 探讨数据持久化，涉及数据库连接、ORM工具和数据存储解决方案。 6. **Chapter 6：测试Node应用** - 介绍测试Node应用的方法，确保代码质量和可靠性。 7. **Chapter 7：Connect** - 一个中间件库，用于简化Web应用开发过程。 8. **Chapter 8：Connect内置中间件** - 分析Connect提供的各种功能，如路由、身份验证等。 9. **Chapter 9：Express** - 一个流行的Node.js Web框架，实现快速开发高性能应用。 10. **Chapter 10：Web应用模板** - 如何使用模板引擎来提升Web界面的可维护性和美观性。 11. **Chapter 11：部署Node web应用** - 讨论生产环境下的部署策略，包括负载均衡、监控与日志管理。 **第三部分：深入探索Node.js** 12. **Chapter 12：超越Web服务器** - 探索Node.js在其他领域的应用，如消息队列、实时分析等。 13. **Chapter 13：Node.js生态系统** - 描述Node.js周边丰富的库、框架和工具，帮助读者了解生态系统的广阔性。附录部分： - **Appendix A：安装Node.js及社区插件** - 提供了安装和配置Node.js及其常用扩展的步骤。 - **Appendix B：调试Node.js** - 包含调试技巧和工具，帮助开发者解决遇到的问题。通过这本书，读者可以系统地学习和掌握Node.js的基础知识和实践技能，适合希望深入理解并应用于Web开发和实时应用领域的IT专业人士。

when all the chunks have been loaded. A 'chunk' can vary in size depending on the

type of data. This low level access to the read stream allows you efficiently deal

with data as it is read instead of waiting for it all to buffer in memory.

Node also provides writable streams that you can write chunks of data to. One

of those is the response ( ) object when a 'request' happens on an HTTP server.res

Readable and writeable streams can be connected to make pipes much like the

operator in shell scripting. This provides an efficient way to write out| (pipe)

data as soon as it's ready without waiting for the complete resource to be read and

then written out. Let's use our HTTP server from before to illustrate streaming an

image to a client:

var http = require('http');

var fs = require('fs');

http.createServer(function (req, res) {

res.writeHead(200, {'Content-Type': 'image/png'});

fs.createReadStream('./image.png').pipe(res);

}).listen(3000);

console.log('Server running at http://localhost:3000/');

In this one-liner, the data is read in from the file ( )fs.createReadStream

and being sent out ( ) to the client ( ) as it comes in. The event loop is.pipe res

able to handle other events while data is being streamed.

Node provides this "DIRTy by default" approach across multiple platforms

including various UNIXes and Windows. The underlying asynchronous I/O library

(libuv) was built specifically to provide a unified experience regardless of the

parent operating system which allows programs to be more easily ported across

devices and run on multiple devices if needed.

Like any technology, Node is not a silver bullet, it just tries to tackle certain

problems and open new possibilities. One of the interesting things about Node is it

brings people from all aspects of the system together. Many come to Node being

JavaScript client-side programmers, others are server-side programmers, and others

are systems level programmers. Wherever you fit, we hope you have an

understanding of where Node may fit in your stack. To review:

Node is:

Built on JavaScript

Piping from a

readable stream to

a writeable stream.

1.6 In Summary

http://www.manning-sandbox.com/forum.jspa?forumID=790

Licensed to Roger Chen <annie@geniachip.com>

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