Node.js实战指南：构建全方位Web应用与进阶技术

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"《Node.js in Action》是一本由Manning Publications出版的全面深入的Node.js开发指南，适合于开发者在实践中理解和掌握Node.js技术。该书共分为三个部分：第一部分：Node基础知识 - 第1章：欢迎来到Node.js，旨在介绍Node.js的核心理念和环境设置，让读者对这个异步I/O驱动的JavaScript运行时环境有初步了解。 - 第2章：构建一个多房间聊天应用，通过实例演示如何利用Node.js处理并发请求，展示其事件驱动的特性。 - 第3章：深入Node编程基础，讲解回调函数、事件循环、模块系统等内容，帮助读者建立坚实的Node.js编程基础。第二部分：Node Web应用开发 - 第4章：构建Node web应用程序，阐述如何利用Node.js的HTTP服务器模块创建基本的网络服务。 - 第5章：存储Node应用数据，涉及数据库操作，如使用各种ORM工具（如MongoDB）或RESTful API与后端交互。 - 第6章：测试Node应用，介绍单元测试、集成测试和性能测试的实践方法，确保代码质量。 - 第7章：Connect模块介绍，一个基础的web框架，为更高级框架如Express提供支持。 - 第8章：Connect的内置中间件，展示了如何扩展和定制HTTP请求处理流程。 - 第9章：Express框架，详细讲解如何使用Express来构建高效、可扩展的web应用。 - 第10章：Web应用模板引擎，探讨如何利用如EJS或Pug等模板引擎简化视图层的开发。 - 第11章：部署Node web应用，涵盖云平台部署、负载均衡和安全设置等方面。第三部分：Node进阶及生态系统 - 第12章：超越web服务器，探讨Node.js在实时通信、消息队列、WebSocket等领域的应用。 - 第13章：Node.js生态系统概览，包括npm包管理器、社区最佳实践和常用库的介绍，帮助读者扩展功能和发现新的开发工具。附录部分提供了： - 附录A：安装Node.js和社区插件的指南，帮助新手配置开发环境。 - 附录B：调试Node.js应用的技巧，解决开发过程中的常见问题。这本文档对于想要深入了解Node.js并将其应用于实际项目中的开发者来说，是一份宝贵的参考资料和实战教程。读者可以通过阅读本书，逐步提升Node.js编程技能，以及在构建现代web应用和服务时的实践经验。"

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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