JavaScript忍者秘籍：jQuery作者力作

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"Secrets of the JavaScript Ninja 是一本由jQuery作者John Resig编著的书籍，由Bear Bibeault合著，由Manning出版社出版。这本书深入探讨JavaScript编程的高级技巧和策略，旨在帮助读者成为JavaScript编程的高手。" 在《Secrets of the JavaScript Ninja》一书中，John Resig分享了他的JavaScript编程智慧，这本书对JavaScript的核心概念进行了深入的讲解，并涵盖了实用的编程技巧和最佳实践。作为jQuery库的创建者，Resig在书中可能涉及了如何利用JavaScript的灵活性和强大功能来构建高性能、可维护的Web应用。该书可能包含以下主要知识点： 1. **JavaScript基础**：包括变量、数据类型、控制结构（如条件语句和循环）、函数、对象和原型等基本概念的深入理解和应用。 2. **作用域与闭包**：解释JavaScript的作用域规则，如何使用闭包来封装变量和实现私有成员，以及它们在内存管理中的角色。 3. **事件处理与DOM操作**：鉴于John Resig与jQuery的关系，这部分可能会讲解如何优雅地处理DOM（文档对象模型）事件和进行高效的DOM操作。 4. **函数式编程**：介绍JavaScript中的函数式编程概念，如高阶函数、函数组合、柯里化等，以及如何将这些概念应用于实际项目中。 5. **异步编程**：讨论回调函数、Promise和async/await等处理异步操作的方法，以及如何避免回调地狱。 6. **性能优化**：提供关于代码性能调优的策略，如减少DOM操作、优化循环和使用事件委托等。 7. **模块化与打包工具**：可能涉及CommonJS、ES6模块，以及使用webpack或Rollup等工具进行模块打包。 8. **测试与调试**：介绍如何编写单元测试，使用开发者工具进行高效调试，以及如何建立持续集成和持续部署(CI/CD)流程。 9. **JavaScript最新特性**：可能涵盖ECMAScript的新特性，如箭头函数、解构赋值、类和模板字符串等，以及对ES6及后续版本的支持。 10. **跨平台JavaScript**：讨论如何使用JavaScript进行移动应用开发（如React Native）和服务器端编程（如Node.js）。通过阅读《Secrets of the JavaScript Ninja》，读者不仅可以提升JavaScript编程技能，还能掌握如何像“忍者”一样高效、灵活地编写代码。此书对于希望在Web开发领域深化理解并提升专业水平的开发者来说是一份宝贵的资源。

about this book

JavaScript is important. That wasn’t always so, but it’s true now.

Web applications are expected to give users a rich user interface experience, and

without JavaScript, you might as well just be showing pictures of kittens. More than

ever, web developers need to have a sound grasp of the language that brings life to

web applications.

And like orange juice and breakfast, JavaScript isn’t just for browsers anymore. The

language has knocked down the walls of the browser and is being used on the server

in engines such as Rhino and V8, and in frameworks like Node.js.

Although this book is primarily focused on JavaScript for web applications, the

fundamentals of the language presented in part 2 of this book are applicable across

the board.

With more and more developers using JavaScript, it’s now more important

than ever that they grasp its fundamentals, so that they can become true ninjas of

the language.

Audience

This is not your first JavaScript book. If you’re a complete novice to JavaScript, or you

only understand a handful of statements by searching the web for code snippets, this

is not the book for you. Yet.

This book is aimed at web developers who already have at least a basic grasp of

JavaScript. You should understand the basic structure of JavaScript statements and

how they work to create straightforward on-page scripts. You don’t need to be an

ABOUT THIS BOOK

xvi

advanced user of the language—that’s what this book is for—but you shouldn’t be a

rank novice.

You should also have a working knowledge of

HTML

and

CSS

. Again, nothing too

advanced, but you should know the basics of putting a web page together.

If you want some good prerequisite material, grab one of the popular books on

JavaScript and web development, and then tackle this one. We can recommend

JavaScript: The Definitive Guide by David Flanagan, JavaScript: The Good Parts by Douglas

Crockford, and Head First JavaScript by Michael Morrison.

Roadmap

This book is organized to take you from an apprentice to a ninja in four parts.

Part 1 introduces the topic and some tools we’ll need as we progress through the

rest of the book.

Part 2 focuses on JavaScript fundamentals: aspects of the language that you take

for granted but aren’t really sure how they work. This may be the most important part

of the book, and even if it’s all you read, you’ll come away with a much sounder under-

standing of JavaScript, the language.

In part 3, we dive into using the fundamentals that we learned in part 2 to solve

knotty problems that the browsers throw at us.

Part 4 wraps up the book with a look at advanced topics focusing on lessons

learned from the creation of advanced JavaScript libraries, such as jQuery.

Let’s take a brief look at what each chapter will cover.

Chapter 1 introduces us to the challenges that we face as writers of advanced web

applications. It presents some of the problems that the proliferation of browsers cre-

ates, and suggests best current practices that we should follow when developing our

applications, including testing and performance analysis.

Chapter 2 discusses testing, taking a look at the current state of testing and test

tools. It also introduces a small but powerful testing concept, the assert, which will be

used extensively throughout the remainder of the book to make sure that our code

does what we think it should be doing (or sometimes to prove that it doesn’t!).

Armed with these tools, chapter 3 begins our foray into the fundamentals of the

language, starting, perhaps to your surprise, with a thorough examination of the func-

tion as defined by JavaScript. Although you might have expected the object to be the

target of first focus, it’s a solid understanding of the function, and JavaScript as a func-

tional language, that begins our transformation from run-of-the-mill JavaScript coders

to JavaScript ninjas!

Not being done with functions quite yet, chapter 4 takes the fundamentals we

learned in chapter 3 and applies them to problems we face in creating our applica-

tions. We’ll explore recursion—not only for its own sake, but because we can learn a

lot more about functions through scrutinizing it—and we’ll learn how the functional

programming aspects of JavaScript can be applied to not only make our code elegant,

but also more robust and succinct. We’ll learn ways to deal with variable argument

ABOUT THIS BOOK

xvii

lists, and ways to overload functions in a language that doesn’t natively support the

object-oriented concept of method overloading.

One of the most important concepts you can take away from this book is the sub-

ject of chapter 5: closures. A key concept in functional programming, closures allow

us to exert fine-grained control over the scope of objects that we declare and create in

our programs. The control of these scopes is the key factor in writing code worthy of a

ninja. Even if you stop reading after this chapter (but we hope that you don’t), you’ll

be a far better JavaScript developer than when you started.

Objects are finally addressed in chapter 6, where we learn how patterns of objects

can be created through the

prototype

property of the function, and we’ll learn how

objects are tied to functions for their definitions—one of the many reasons we dis-

cussed functions first.

Chapter 7 focuses on the regular expression, an often-overlooked feature of

the language that can do the work of scores of lines of code when used correctly.

We’ll learn how to construct and use regular expressions and how to solve some

recurring problems elegantly, using regular expressions and the methods that work

with them.

Part 2 on language fundamentals closes out with chapter 8, in which we learn how

timers and intervals work in the single-threaded nature of JavaScript.

HTML5

promises

to bring us relief from the confines of the single thread with web workers, but most

browsers aren’t quite there yet, and virtually all of the existing JavaScript code

depends upon a good understanding of JavaScript’s single-threaded model.

Part 3 opens with chapter 9, in which we open the black box of JavaScript’s run-

time code evaluation. We’ll look at various ways to evaluate code on the fly, including

how to do so safely and in the scope of our choosing. Real-world examples, such as

JSON

evaluation, metalanguages (a.k.a. domain-specific languages), compression and

obfuscation, and even aspect-oriented programming, are discussed.

In chapter 10, we examine the controversial

with

statement, which is used to

shorten references within a scope. Whether you are a fan or detractor of

with

, it exists

in a lot of code in the wild, and you should understand it regardless of whether you

think it’s the bomb or an abomination.

Dealing with cross-browser issues is the subject of chapter 11. We examine the five

key development concerns with regard to these issues: browser differences, bugs and

bug fixes, external code and markup, missing features, and regressions. Strategies

such as feature simulation and object detection are discussed at length to help us deal

with these cross-browser challenges.

Handling element attributes, properties, and styles is the focus of chapter 12.

While the differences in how the various browsers handle these aspects of elements

are slowly converging over time, there still exists a number of knotty problems that

this chapter describes how to solve.

Part 3 concludes in chapter 13 with a thorough investigation of event handling

in the browsers and ways to create a unified subsystem that handles events in a

ABOUT THIS BOOK

xviii

browser-agnostic manner. This includes adding features not provided by the browsers,

such as custom events and event delegation.

In part 4 we pick up the pace and delve deeply into advanced topics taken from the

heart of JavaScript libraries such as jQuery. Chapter 14 discusses how

DOM

manipula-

tion

API

s can be constructed to manipulate the Document Object Model at runtime,

including the Gordian knot of injecting new elements into the

DOM

Finally, in chapter 15, we discuss how

CSS

selector engines are constructed and the

different ways in which they parse and evaluate selectors. Not for the faint of heart,

this chapter, but it’s a worthy final test of your ninja-hood.

Code conventions

All source code in listings or in the text is in a

fixed-width

font

this

to sepa-

rate it from ordinary text. Method and function names, properties,

XML

elements,

and attributes in the text are also presented in this same font.

In some cases, the original source code has been reformatted to fit on the pages.

In general, the original code was written with page-width limitations in mind, but

sometimes you may find a slight formatting difference between the code in the book

and that provided in the source download. In a few rare cases, where long lines could

not be reformatted without changing their meaning, the book listings contain line-

continuation markers.

Code annotations accompany many of the listings, highlighting important con-

cepts. In many cases, numbered bullets link to explanations that follow in the text.

Code downloads

Source code for all the working examples in this book (along with some extras that

never made it into the text) is available for download from the book’s web page at

www.manning.com/SecretsoftheJavaScriptNinja.

The code examples for this book are organized by chapter, with separate folders

for each chapter. The layout is ready to be served by a local web server, such as the

Apache

HTTP

Server. Simply unzip the downloaded code into a folder of your choice

and make that folder the document root of the application.

With a few exceptions, most of the examples don’t require the presence of a web

server at all and can be loaded directly into a browser for execution, if you so desire.

All examples were tested in a variety of modern browsers (as of mid-2012), includ-

ing Internet Explorer 9, Firefox, Safari, and Google Chrome.

Author online

The authors and Manning Publications invite you to the book’s forum, run by Man-

ning Publications, where you can make comments about the book, ask technical ques-

tions, and receive help from the authors and other users. To access and subscribe to

the forum, point your browser to www.manning.com/SecretsoftheJavaScriptNinja and

click the Author Online link. This page provides information on how to get on the

ABOUT THIS BOOK

xix

forum once you are registered, what kind of help is available, and the rules of conduct

in the forum.

Manning’s commitment to our readers is to provide a venue where a meaningful

dialogue between individual readers and between readers and the authors can take

place. It’s not a commitment to any specific amount of participation on the part of the

authors, whose contribution to the book’s forum remains voluntary (and unpaid). We

suggest you try asking the authors some challenging questions, lest their interest stray!

The Author Online forum and the archives of previous discussions will be accessi-

ble from the publisher’s website as long as the book is in print.

About the cover illustration

The figure on the cover of Secrets of the JavaScript Ninja is captioned “Noh Actor,

Samurai,” from a woodblock print by an unknown Japanese artist of the mid-nineteenth

century. Derived from the Japanese word for talent or skill, Noh is a form of classical

Japanese musical drama that has been performed since the 14th century. Many char-

acters are masked, with men playing male and female roles. The samurai, a hero fig-

ure in Japan for hundreds of years, was often featured in the performances, and in

this print the artist renders with great skill the beauty of the costume and the ferocity

of the samurai.

Samurai and ninjas were both warriors excelling in the Japanese art of war, known

for their bravery and cunning. Samurai were elite soldiers, well-educated men who

knew how to read and write as well as fight, and they were bound by a strict code of

honor called Bushido (The Way of the Warrior), which was passed down orally from

generation to generation, starting in the 10th century. Recruited from the aristocracy

and upper classes, analagous to European knights, samurai went into battle in large

formations, wearing elaborate armor and colorful dress meant to impress and intimi-

date. Ninjas were chosen for their martial arts skills rather than their social standing

or education. Dressed in black and with their faces covered, they were sent on mis-

sions alone or in small groups to attack the enemy with subterfuge and stealth, using

any tactics to assure success; their only code was one of secrecy.

The cover illustration is from a set of three Japanes prints owned for many years by

a Manning editor, and when we were looking for a ninja for the cover of this book, the

striking samurai print came to our attention and was selected for its intricate details,

vibrant colors, and vivid depiction of a ferocious warrior ready to strike—and win.

At a time when it is hard to tell one computer book from another, Manning cele-

brates the inventiveness and initiative of the computer business with book covers

based on two-hundred-year-old illustrations that depict the rich diversity of traditional

costumes from around the world, brought back to life by prints such as this one.

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