JavaScript权威指南(第六版)PDF高清版

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“JavaScript权威指南（第六版）是David Flanagan所著的一本关于JavaScript编程的高清PDF书籍。这本书深入浅出地介绍了JavaScript的核心概念、语法和高级特性。” 在这本第六版的“JavaScript权威指南”中，作者David Flanagan全面且详细地探讨了JavaScript语言的各个方面。JavaScript是一种广泛应用于网页和互联网应用的脚本语言，它允许开发者实现动态内容、用户交互以及服务器通信等功能。以下是本书可能涵盖的一些关键知识点： 1. **基础语法**：书中会讲解JavaScript的基础语法，包括变量声明、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）以及函数的使用。 2. **对象和原型**：JavaScript中的对象是基于原型的，这意味着你可以通过原型链来共享属性和方法。这一部分可能会详细阐述如何创建和操作对象，以及原型和继承的工作机制。 3. **函数与闭包**：函数在JavaScript中既是第一类对象，也可以作为参数传递或作为其他函数的返回值。闭包是JavaScript中的一个重要特性，用于实现私有变量和模块化。 4. **作用域和作用域链**：理解变量的作用域（全局和局部）以及作用域链对于避免变量冲突和优化代码至关重要。 5. **事件处理**：JavaScript通常用于处理用户交互，如点击按钮、滚动页面等。书中会介绍如何添加和管理事件监听器，以及如何处理事件。 6. **DOM操作**：文档对象模型（DOM）是HTML和XML文档的结构表示，JavaScript通过DOM可以动态修改网页内容。书中有详细教程关于如何选择、修改和创建DOM元素。 7. **AJAX和Fetch API**：这些技术用于在不刷新整个页面的情况下与服务器进行异步通信，提升用户体验。 8. **错误处理**：书中会介绍如何使用try...catch语句进行异常处理，以及如何有效地编写健壮的代码。 9. **ECMAScript新特性**：随着JavaScript的发展，新的版本（如ES6、ES7及更高版本）引入了许多新特性和语法糖，如箭头函数、模板字符串、Promise、async/await等，这些都会在书中有所涉及。 10. **性能优化**：书中可能会讨论如何编写高效的JavaScript代码，包括减少内存占用、优化循环和避免阻塞浏览器UI等技巧。 11. **调试和测试**：了解如何使用开发者工具进行调试，以及编写单元测试和集成测试的方法。 12. **安全问题**：JavaScript编程中的一些常见安全风险，如XSS跨站脚本攻击和CSRF跨站请求伪造，以及如何防止这些攻击。这本书不仅适合初学者入门，也对有经验的开发者提供了深入的技术参考。通过阅读“JavaScript权威指南（第六版）”，读者能够掌握JavaScript的核心知识，同时了解到最新的语言发展动态，从而提升自己的编程技能。

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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