深入理解Node.js：实战篇

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"Node.js in Action 是一本关于Node.js技术的书籍，主要涵盖了Node.js的基础、Web应用开发以及深入探索Node.js的多个方面。通过这本书，读者可以学习到如何构建多房间聊天应用、掌握Node.js编程基础、进行Node.js Web应用开发、存储应用数据、测试应用、使用Connect和Express框架、实现Web应用模板、部署Node.js应用，并了解Node.js生态系统的更多内容。此外，书中还提供了安装Node.js和社区附加组件的指南以及调试Node.js的技巧。" 本书分为三个部分： **Part 1: Node.js Fundamentals** 1. 第1章“欢迎来到Node.js”介绍了Node.js的基本概念，包括其非阻塞I/O模型、事件驱动架构和JavaScript运行时环境。 2. 第2章“构建多房间聊天应用”通过一个实际项目，让读者亲手实践Node.js的网络编程和实时通信能力。 3. 第3章“Node编程基础”深入讲解了Node.js的核心模块、模块系统、文件系统操作、进程管理和错误处理。 **Part 2: Web Application Development with Node** 4. 第4章“构建Node.js Web应用”涵盖了HTTP服务器、路由处理和响应生成。 5. 第5章“存储Node应用数据”讨论了数据库连接、查询和数据持久化，可能涉及MongoDB、MySQL等数据库。 6. 第6章“测试Node应用”介绍单元测试、集成测试和持续集成工具，如Mocha和Jest。 7. 第7章“Connect”讲解了Connect作为Node.js中间件的基础框架，及其在Web开发中的作用。 8. 第8章“Connect的内置中间件”深入探讨Connect的常用中间件，如session管理、静态文件服务等。 9. 第9章“Express”介绍了Express框架，它是基于Connect的高级Web应用框架，简化了Node.js Web应用的构建。 10. 第10章“Web应用模板”涵盖了模板引擎如EJS、Jade（现在称为Pug）等，用于动态生成HTML页面。 11. 第11章“部署Node.js Web应用”涵盖了云服务提供商、负载均衡、日志管理和性能优化。 **Part 3: Going Further with Node** 12. 第12章“超越Web服务器”探讨了Node.js在构建CLI工具、桌面应用、物联网(IoT)项目等领域的应用。 13. 第13章“Node生态系统”介绍了Node.js的包管理器npm，以及丰富的社区库、工具和最佳实践。附录包括： - A. 安装Node.js和社区添加组件，提供了不同平台的安装指南和第三方库的获取方法。 - B. 调试Node.js，讲解了如何使用内置的调试工具和其他第三方调试解决方案。这本书对于想要深入了解Node.js的开发者来说是一份宝贵的资源，无论你是初学者还是有一定经验的开发者，都能从中受益匪浅。通过阅读和实践，你将能够熟练地运用Node.js开发高效、可扩展的Web应用和更多创新项目。

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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