JavaScript权威第六版：开发与学习全面参考

JavaScript

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《JavaScript权威指南第6版英文版》是一本深入且全面的编程参考书籍，由David Flanagan撰写，专为JavaScript开发者设计。作为第六次修订版，它紧跟JavaScript语言的发展步伐，旨在帮助读者理解和掌握这门广泛应用于Web开发中的脚本语言。该书详细介绍了JavaScript的核心概念，包括变量、数据类型、控制结构（如循环和条件语句）、函数、对象和类、原型继承、异步编程（如回调函数和Promise）、以及最新的ECMAScript标准（ES6及后续版本）。书中还涵盖了浏览器环境下的JavaScript特性，如DOM操作、事件处理、BOM（浏览器对象模型）以及AJAX技术。第六版特别关注了JavaScript在现代Web开发中的新趋势，比如模块化、Node.js环境下的服务器端开发、模块加载器和构建工具（如Webpack或Rollup），以及JavaScript在Web组件、服务端渲染、Web Workers等方面的应用。此外，书中还包含了大量实用示例和代码片段，以便读者通过实践加深理解。作为一本权威指南，它不仅适合初学者系统学习JavaScript基础知识，也适合有一定经验的开发者作为查漏补缺的参考工具，或者作为提升技能、跟上技术更新的参考资料。无论你是想要从头开始学习，还是希望巩固和扩展已有的JavaScript知识库，这本书都提供了详尽而深入的指导。对于教育机构和个人而言，这本英文版的《JavaScript权威指南》不仅有助于教学，也是在线学习资源的理想补充，因为O'Reilly Media提供了电子版供用户访问，方便随时随地学习。同时，书中附带的索引和营养手册使得查找特定主题变得十分容易，极大地提高了学习效率。《JavaScript权威指南第6版英文版》是JavaScript开发人员不可或缺的宝典，无论是新手还是资深开发者，都可以从中获益匪浅，不断提升自己的编程技能和解决实际问题的能力。

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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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