Node.js服务器端JavaScript开发实战

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"NodeWebDevelopment——一本由DavidHerron编写的关于Node.js服务器端JavaScript web开发的实践教程。" 在当今的Web开发领域，Node.js是一个备受瞩目的技术，它允许开发者使用JavaScript语言在服务器端进行编程。Node.js的核心特性是其非阻塞I/O模型，这使得它在处理高并发请求时表现优秀，尤其适合实时应用如聊天、协作工具和流媒体服务。 "NodeWebDevelopment"这本书提供了一个实用的介绍，引导读者进入Node.js的世界。通过本书，你可以学习到如何利用Node.js构建高性能的Web服务器，理解事件驱动编程的概念，以及如何利用Node.js的模块系统来组织和管理代码。 Node.js的核心库包括HTTP模块，允许开发者创建HTTP服务器，这是构建Web应用的基础。此外，书中还会涵盖文件系统操作，使你能与本地文件系统交互，实现数据存储和读取。Node.js还提供了强大的套接字（Socket）支持，用于实现客户端和服务器之间的实时通信。 JavaScript是Node.js的语言基础，因此你也需要熟悉JavaScript的基本语法和特性，包括异步编程、闭包、原型继承等。本书可能会深入讲解如何将这些概念应用到Node.js的开发中。标签中的"javascript"表明，你需要了解JavaScript语言，它是所有Node.js开发的基础。"server"则意味着本书将侧重于服务器端的开发，而不是前端的浏览器环境。通过阅读本书，你还将接触到npm（Node Package Manager），它是Node.js的包管理器，用于安装、管理和分享第三方模块。这些模块可以极大地扩展Node.js的功能，比如Express.js用于快速构建Web应用，Mongoose用于MongoDB数据库操作，或者Socket.IO实现跨平台的实时通信。 "NodeWebDevelopment"将帮助你掌握Node.js的核心概念和技术，包括服务器创建、事件驱动编程、模块化以及JavaScript在服务器端的应用。通过实践项目和案例，你将能够独立地开发出高效、可扩展的Node.js应用程序。

Preface

[ 3 ]

While the book is about developing web applications, it does not require you to have

a web server. Node provides its own web server stack.

Who this book is for

This book was written for any software engineer who wants the adventure that

comes with a new software platform embodying a new programming paradigm.

Server-side engineers may nd the concepts refreshing, giving you a different

perspective on web application development. JavaScript is a powerful language and

Node's asynchronous nature plays to JavaScript's strengths.

Developers experienced with JavaScript in the browser may nd it fun to bring that

knowledge to a new territory, and to write in JavaScript without accessing the DOM.

(There's no browser, hence no DOM, unless you install JSDom.)

While the chapters build on each other, how you read this book is up to you.

We assume you already know how to write software, and have an understanding of

modern programming languages such as JavaScript.

Conventions

In this book, you will nd a number of styles of text that distinguish between

different kinds of information. Here are some examples of these styles, and an

explanation of their meaning.

Code words in text are shown as follows: "The

http object encapsulates the HTTP

protocol and its http.createServer method creates a whole web server, listening

on the port specied in the .listen method."

A block of code is set as follows:

var http = require('http');

http.createServer(function (req, res) {

res.writeHead(200, {'Content-Type': 'text/plain'});

res.end('Hello World\n');

}).listen(8124, "127.0.0.1");

console.log('Server running at http://127.0.0.1:8124/');

When we wish to draw your attention to a particular part of a code block, the

relevant lines or items are set in bold:

var util = require('util');

var A = "a different value A";

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