掌握Node.js：构建高效可扩展网络应用实战指南

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"《学习Node》是一本实用指南，旨在帮助读者将Web开发技能从浏览器扩展到服务器，掌握基于JavaScript的Node.js平台。作者Shelley Powers通过深入浅出的方式，让读者快速理解和掌握Node的核心基础，包括其事件驱动、异步I/O模型，这对于处理数据密集型应用特别有用，这些应用访问频繁但计算需求简单。书中详细介绍了Node的独特异步开发方法，如何使用Express框架和Connect中间件构建实际的Node应用程序。同时，读者将学习如何利用NoSQL解决方案，如Redis和MongoDB，以及探索Node与关系数据库模块的结合。处理PDF文件、服务HTML5媒体、利用Canvas进行图形创建的能力也在本书中得到演示。 WebSocket技术在本书中也占有重要位置，它促进了浏览器和服务器之间的双向通信。此外，书中还提供了深入的调试和测试实践，确保应用程序的质量和稳定性。对于部署，无论是云计算环境还是个人系统，都有详细的指导。《学习Node》特别适合那些熟悉JavaScript的开发者，无论背景如何，都能轻松上手，通过这本书构建出令人惊叹的项目。该书由Simon St. Laurent担任编辑，Rachel Steely负责生产编辑，Rachel Monaghan负责校对，而封面设计、内页设计和插图则由Karen Montgomery、David Futato、Robert Romano和Rebecca Demarest等人协作完成。第一版于2012年8月24日发布，不断更新以提供最新的技术资讯和解决方案。读者可以通过O'Reilly官网获取更多相关资源和错误修正信息。"

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xiv | Preface

Setting Up a Node Development Environment

There is more than one way to install Node in most environments. Which approach

you use is dependent on your existing development environment, your comfort level

working with source code, or how you plan to use Node in your existing applications.

Package installers are provided for both Windows and Mac OS, but you can install

Node by grabbing a copy of the source and compiling the application. You can also use

Git to clone (check out) the Node repo (repository) in all three environments.

In this section I’m going to demonstrate how to get Node working in a Linux system

(an Ubuntu 10.04 VPS, or virtual private server), by retrieving and compiling the source

directly. I’ll also demonstrate how to install Node so that you can use it with Microsoft’s

WebMatrix on a Windows 7 PC.

Download source and basic package installers for Node from http://no

dejs.org/#download. There’s a wiki page providing some basic instruc-

tion for installing Node in various environments at https://github.com/

joyent/node/wiki/Installing-Node-via-package-manager. I also encour-

age you to search for the newest tutorials for installing Node in your

environment, as Node is very dynamic.

Installing Node on Linux (Ubuntu)

Before installing Node in Linux, you need to prepare your environment. As noted in

the documentation provided in the Node wiki, first make sure Python is installed, and

then install libssl-dev if you plan to use SSL/TLS (Secure Sockets Layer/Transport Layer

Security). Depending on your Linux installation, Python may already be installed. If

not, you can use your systems package installer to install the most stable version of

Python available for your system, as long as it’s version 2.6 or 2.7 (required for the most

recent version of Node).

This book assumes only that you have previous experience with Java-

Script and traditional web development. Given that, I’m erring on the

side of caution and being verbose in descriptions of what you need to

do to install Node.

For both Ubuntu and Debian, you’ll also need to install other libraries. Using the Ad-

vanced Packaging Tool (APT) available in most Debian GNU/Linux systems, you can

ensure the libraries you need are installed with the following commands:

sudo apt-get update

sudo apt-get upgrade

sudo apt-get install build-essential openssl libssl-dev pkg-config

2 | Chapter 1:

Node.js: Up and Running

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