深入理解JavaScript：大卫·弗拉纳根第6版精要

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“JavaScript The Definitive Guide 6th Edition Apr 2011” 是一本由David Flanagan编写的关于JavaScript编程语言的经典教程，旨在帮助读者深入理解和掌握JavaScript的核心概念和技术。本书是JavaScript领域的权威指南，第六版在2011年发布，覆盖了JavaScript的最新发展和变化。作者David Flanagan是一位知名的计算机科学家和作家，他在软件开发领域有着丰富的经验和深厚的专业知识，尤其在JavaScript方面有独到的见解。本教程涵盖了以下关键知识点： 1. **基础语法**：讲解JavaScript的基础语法，包括变量、数据类型（如字符串、数字、布尔值、对象和数组）、运算符、流程控制（如条件语句和循环）以及函数。 2. **DOM操作**：介绍如何使用JavaScript与网页的HTML和CSS进行交互，包括文档对象模型（DOM）的概念，以及如何通过JavaScript选择、修改和操作DOM元素。 3. **事件处理**：详细阐述JavaScript事件处理机制，如事件监听器、事件冒泡和事件委托，以及如何响应用户交互。 4. **AJAX与异步通信**：讲解如何使用XMLHttpRequest对象实现异步数据交换，创建动态和交互性强的Web应用。 5. **闭包与作用域**：深入探讨JavaScript中的作用域规则和闭包，这对于理解函数内部变量的生命周期和封装至关重要。 6. **面向对象编程**：介绍JavaScript的面向对象特性，如构造函数、原型链、继承和模块模式。 7. **正则表达式**：讲解JavaScript中的正则表达式，用于文本匹配和替换，是处理字符串的强大工具。 8. **错误处理**：讨论如何在JavaScript中捕获和处理运行时错误，提高代码的健壮性。 9. **JSON**：介绍JavaScript Object Notation（JSON）格式，它是数据交换的一种轻量级格式，与JavaScript对象语法紧密相关。 10. **高级特性**：涵盖ECMAScript新版本引入的特性，如箭头函数、Promise、async/await等，帮助读者保持对最新技术的了解。此外，书中还提供了大量的示例代码和练习，帮助读者巩固所学知识，并提供实践机会。每章末尾通常会有小结和参考文献，方便读者回顾和进一步研究。 “JavaScript The Definitive Guide”第六版不仅适合初学者，也适用于有一定经验的开发者，它全面、深入地探讨了JavaScript的各个方面，是提升JavaScript技能不可或缺的参考资料。

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A Note About Piracy

If you are reading a digital version of this book that you (or your employer) did not pay

for (or borrow from someone who did) then you probably have an illegally pirated copy.

Writing the sixth edition of this book was a full-time job, and it took more than a year.

The only way I get paid for that time is when readers actually buy the book. And the

only way I can afford to work on a seventh edition is if I get paid for the sixth.

I do not condone piracy, but if you have a pirated copy, go ahead and read a couple of

chapters. I think that you’ll find that this is a valuable source of information about

JavaScript, better organized and of higher quality than what you can find freely (and

legally) available on the Web. If you agree that this is a valuable source of information,

then please pay for that value by purchasing a legal copy (either digital or print) of the

book. On the other hand, if you find that this book is no more valuable than the free

information on the web, then please discard your pirated copy and use those free

information sources.

Conventions Used in This Book

I use the following typographical conventions in this book:

Italic

Is used for emphasis and to indicate the first use of a term. Italic is also used for

email addresses, URLs and file names.

Constant width

Is used in all JavaScript code and CSS and HTML listings, and generally for any-

thing that you would type literally when programming.

Constant width italic

Is used for the names of function parameters, and generally as a placeholder to

indicate an item that should be replaced with an actual value in your program.

Example Code

The examples in this book are available online. You can find them linked from the

book’s catalog page at the publisher’s website:

http://oreilly.com/catalog/9780596805531/

This book is here to help you get your job done. In general, you may use the code in

this book in your programs and documentation. You do not need to contact O’Reilly

for permission unless you’re reproducing a significant portion of the code. For example,

writing a program that uses several chunks of code from this book does not require

permission. Selling or distributing a CD-ROM of examples from O’Reilly books does

require permission. Answering a question by citing this book and quoting example

xiv | Preface

code does not require permission. Incorporating a significant amount of example code

from this book into your product’s documentation does require permission.

If you use the code from this book, I appreciate, but do not require, attribution. An

attribution usually includes the title, author, publisher, and ISBN. For example: “Java-

nagan, 978-0-596-80552-4.”

For more details on the O’Reilly code reuse policy, see http://oreilly.com/pub/a/oreilly/

ask_tim/2001/codepolicy.html. If you feel your use of the examples falls outside of the

permission given above, feel free to contact O’Reilly at permissions@oreilly.com.

Errata and How to Contact Us

The publisher maintains a public list of errors found in this book. You can view the

list, and submit the errors you find, by visiting the book’s web page:

http://oreilly.com/catalog/9780596805531

To comment or ask technical questions about this book, send email to:

bookquestions@oreilly.com

For more information about our books, conferences, Resource Centers, and the

O’Reilly Network, see our website at:

http://www.oreilly.com

Find us on Facebook: http://facebook.com/oreilly

Watch us on YouTube: http://www.youtube.com/oreillymedia

Acknowledgments

Many people have helped me with the creation of this book. I’d like to thank my editor,

Mike Loukides, for trying to keep me on schedule and for his insightful comments.

Thanks also to my technical reviewers: Zachary Kessin, who reviewed many of the

chapters in Part I, and Raffaele Cecco, who reviewed Chapter 19 and the <canvas>

material in Chapter 21. The production team at O’Reilly has done their usual fine job:

Dan Fauxsmith managed the production process, Teresa Elsey was the production

editor, Rob Romano drew the figures, and Ellen Troutman Zaig created the index.

In this era of effortless electronic communication, it is impossible to keep track of all

those who influence and inform us. I’d like to thank everyone who has answered my

questions on the es5, w3c, and whatwg mailing lists, and everyone who has shared their

insightful ideas about JavaScript programming online. I’m sorry I can’t list you all by

Preface | xv

JavaScript: Names and Versions

JavaScript was created at Netscape in the early days of the Web, and technically, “Java-

Script” is a trademark licensed from Sun Microsystems (now Oracle) used to describe

Netscape’s (now Mozilla’s) implementation of the language. Netscape submitted the

language for standardization to ECMA—the European Computer Manufacturer’s As-

sociation—and because of trademark issues, the standardized version of the language

was stuck with the awkward name “ECMAScript.” For the same trademark reasons,

Microsoft’s version of the language is formally known as “JScript.” In practice, just

about everyone calls the language JavaScript. This book uses the name “ECMAScript”

only to refer to the language standard.

For the last decade, all web browsers have implemented version 3 of the ECMAScript

standard and there has really been no need to think about version numbers: the lan-

guage standard was stable and browser implementations of the language were, for the

most part, interoperable. Recently, an important new version of the language has been

defined as ECMAScript version 5 and, at the time of this writing, browsers are beginning

to implement it. This book covers all the new features of ECMAScript 5 as well as all

the long-standing features of ECMAScript 3. You’ll sometimes see these language ver-

sions abbreviated as ES3 and ES5, just as you’ll sometimes see the name JavaScript

abbreviated as JS.

When we’re speaking of the language itself, the only version numbers that are relevant

are ECMAScript versions 3 or 5. (Version 4 of ECMAScript was under development

for years, but proved to be too ambitious and was never released.) Sometimes, however,

you’ll also see a JavaScript version number, such as JavaScript 1.5 or JavaScript 1.8.

These are Mozilla’s version numbers: version 1.5 is basically ECMAScript 3, and later

versions include nonstandard language extensions (see Chapter 11). Finally, there are

also version numbers attached to particular JavaScript interpreters or “engines.” Goo-

gle calls its JavaScript interpreter V8, for example, and at the time of this writing the

current version of the V8 engine is 3.0.

To be useful, every language must have a platform or standard library or API of func-

tions for performing things like basic input and output. The core JavaScript language

defines a minimal API for working with text, arrays, dates, and regular expressions but

does not include any input or output functionality. Input and output (as well as more

sophisticated features, such as networking, storage, and graphics) are the responsibility

of the “host environment” within which JavaScript is embedded. Usually that host

environment is a web browser (though we’ll see two uses of JavaScript without a web

browser in Chapter 12). Part I of this book covers the language itself and its minimal

built-in API. Part II explains how JavaScript is used in web browsers and covers the

sprawling browser-based APIs loosely known as “client-side JavaScript.”

Part III is the reference section for the core API. You can read about the JavaScript array

manipulation API by looking up “Array” in this part of the book, for example.

Part IV is the reference section for client-side JavaScript. You might look up “Canvas”

2 | Chapter 1: Introduction to JavaScript

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