Node.js实战：构建网络应用与进阶指南

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"Node.js in Action" 这是一本关于Node.js技术的书籍，属于MEAP（Manning Early Access Program）版，由Manning Publications出版。该书覆盖了Node.js的基础到高级应用，旨在帮助读者深入理解和掌握Node.js的开发技能。在"Node.js Fundamentals"部分，第一章"Welcome to Node.js"将引导读者进入Node.js的世界，介绍其核心概念、运行环境以及为何选择Node.js进行服务器端开发。第二章"Building a multi-room chat application"通过构建一个多房间聊天应用的实例，使读者实践并理解Node.js的异步I/O处理和事件驱动编程。第三章"Node programming fundamentals"则深入探讨Node.js的编程基础，包括模块系统、文件系统操作、网络通信等。 "Web Application Development with Node"是书中的第二个部分，第四章至第十一章详尽介绍了如何使用Node.js构建web应用程序。第四章讲解了构建Node.js web应用的基本步骤和架构。第五章关注数据存储，讨论如何在Node.js应用中管理数据库。第六章涉及测试，教授如何编写和执行有效的单元测试和集成测试。第七章"Connect"介绍了Node.js中的Connect框架，它是中间件驱动的web应用开发工具。第八章到第九章深入Connect的内置中间件和Express框架，Express是基于Connect构建的、广泛使用的web应用框架。第十章"Web application templating"探讨了模板引擎，用于动态生成HTML页面。最后，第十一章"Deploying Node web applications"阐述了Node.js应用的部署策略和最佳实践。在"Going Further with Node"部分，第十二章探讨了Node.js在构建非HTTP服务，如CLI工具、桌面应用或物联网(IoT)项目等方面的应用。第十三章"The Node ecosystem"介绍了Node.js的生态系统，包括包管理器npm、社区库、开发工具和其他辅助资源。附录A提供了Node.js和社区添加组件的安装指南，而附录B专注于调试Node.js应用，帮助开发者解决可能出现的问题。总体而言，这本书是Node.js初学者和进阶者的一份全面教程，涵盖了从基础到实战的各个层面，帮助读者成为熟练的Node.js开发者。

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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