顶级开发者揭示：美丽JavaScript背后的设计与实践策略

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"Beautiful JavaScript"是一本深入探讨JavaScript编程语言的杰作，它揭示了近年来JavaScript在业界的巨大影响力和广泛应用。这本书不仅仅关注浏览器环境，而是涵盖了从Web应用程序、服务器开发到桌面游戏的广泛领域。作者邀请了顶级JavaScript开发者分享他们的经验和独特见解，通过案例研究展示如何巧妙地解决棘手问题，让读者能够全面了解JavaScript生态系统以及专家们的思考方式。书中理论与实践并重，探讨了JavaScript为何能在众多竞争者中脱颖而出，即便它最初被设计得较为匆忙。编者Anton Kovalyov是知名的软件工程师，曾参与创建JSHint和撰写《第三方JavaScript》（Manning出版），他的编审工作确保了内容的专业性和深度。各章节由业内权威如Jacob Thornton、Ariya Hidayat和Sara Chipps等人贡献，他们分享了对JavaScript的独特热爱，无论是如何将看似棘手的功能转化为实用工具，还是如何利用JavaScript进行创新和自我表达。书中的其他贡献者包括前端开发者、技术领导者等，共同构建了一个多元化的视角，帮助读者提升解决问题的能力，并在日常编程挑战中找到最佳解决方案。阅读"Beautiful JavaScript"不仅能增进你对JavaScript语言的理解，还能让你了解到顶级开发者在实际项目中的思考路径和创新策略。无论你是初学者还是经验丰富的开发者，这本书都将为你提供一个珍贵的学习资源，帮助你在JavaScript的世界中更上一层楼。

be inheritable to be visible—and with that simple observation, the entire justiﬁcation

for inheritance hierarchies collapses like a house of cards.

The most basic approach to function reuse is manual delegation—any public function

can be invoked directly via call or apply. It’s a powerful and easily overlooked feature.

However, aside from the verbosity of serial call or apply directives, such delegation is

so convenient that, paradoxically, it sometimes actually works against structural disci-

pline in your code—the invocation process is sufﬁciently ad hoc that in theory there is

no need for developers to organize their code at all.

Mixins are a good compromise: by encouraging the organization of functionality along

thematic lines they offer something of the descriptive prowess of the class hierarchy,

yet they are light and

ﬂexible enough to avoid the premature organization traps (and

head-spinning dizziness) associated with deeply chained, single-ancestry models. Bet-

ter still, mixins require minimal syntax and play very well with unchained JavaScript

prototypes.

The Basics

Traditionally, a mixin is a class that

deﬁnes a set of functions that would otherwise be

deﬁned by a concrete entity (a person, a circle, an observer). However, mixin classes

are considered abstract in that they will not themselves be instantiated—instead, their

functions are copied (or borrowed) by concrete classes as a means of inheriting behav-

ior without entering into a formal relationship with the behavior provider.

Okay, but this is JavaScript, and we have no classes per se. This is actually a good thing

because it means we can use objects (instances) instead, which offer clarity and ﬂexi-

bility: our mixin can be a regular object, a prototype, a function, whatever, and the

mixin process becomes transparent and obvious.

The Use Case

I’m going to discuss a number of mixin techniques, but all the coding examples are

directed toward one use case: creating circular, oval, or rectangular buttons (some-

thing that would not be readily possible using conventional classical inheritance tech-

niques). Here’s a schematic representation: square boxes represent mixin objects, and

rounded boxes represent the actual buttons.

CHAPTER ONE: BEAUTIFUL MIXINS

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顶级开发者揭示：美丽JavaScript背后的设计与实践策略

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