Node.js实战指南：从入门到精通

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《Node.js in Action》是一本深入浅出的Node.js开发指南，专为初学者和进阶开发者设计，由Manning Publications出版。本书在MEAP（早期访问计划）下发布，版权日期为2013年，旨在通过一系列实用项目和理论讲解，帮助读者从基础入门到精通Node.js。第一部分，"Node Fundamentals"，涵盖了Node.js的基础知识和核心概念。第1章"欢迎来到Node.js"将介绍Node.js的基本理念和架构，引导读者理解事件驱动、非阻塞I/O模型。第2章"构建一个多房间聊天应用"通过一个具体的实例，展示如何利用Node.js的实时通信特性。第3章"Node编程基础"则会教授读者如何编写高效、异步的Node.js代码。第二部分，"Web Application Development with Node"，着重于如何利用Node.js进行Web应用程序开发。第4章"构建Node web应用"会介绍如何搭建基本的Web服务器。接着，第5章探讨数据存储，包括如何连接数据库以及最佳实践。测试是开发过程中不可或缺的部分，第6章"测试Node应用"将教给读者如何确保代码质量。第7章和第8章分别介绍了Node.js的两个核心框架，Connect用于简化HTTP服务，而Connect's built-in middleware则提供了增强功能。第9章"Express"是一个流行且功能丰富的Web应用框架，它将进一步提升开发效率。第10章涉及web application templating，即如何使用模板引擎渲染动态内容。最后，第11章"部署Node web应用"涵盖了生产环境下的部署策略和技术。第三部分，"Going Further with Node"，探讨更高级的主题。第12章"超越Web服务器"展示了Node.js在实时流处理、消息队列等领域的应用。第13章"Node生态系统"则深入剖析Node.js周边的工具、库和社区资源，帮助读者拓展视野，找到适合项目的解决方案。附录A和附录B提供了额外的技术支持，如安装Node.js和常用社区插件的指导，以及如何有效地调试Node.js应用。书中还鼓励读者在作者在线论坛上发表评论和提出修正，以促进技术交流与共享。《Node.js in Action》是一本综合了理论与实战的教程，无论你是初次接触Node.js还是希望提升现有技能，都能从中获益匪浅。

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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