构建Web组件：从jQuery到Polymer的实用指南

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"《Developing Web Components 2015.2》是一本由Jarrod Overson和Jason Strimpel合著的专业书籍，专为帮助开发者理解并掌握Web组件技术而编写。这本书在Web编程领域具有重要意义，尤其是在JavaScript库如jQuery与Polymer的发展背景下，它提供了一个从基础到深入的教程，让广大开发者能够轻松上手，构建更强大且可复用的Web组件。书中特别强调了自定义元素和Shadow DOM这两个关键技术，这两个概念是Web平台新特性的重要组成部分，它们有助于实现组件间的组合和封装，从而提升代码的可维护性和模块化程度。通过阅读这本书，读者不仅能学习到如何利用Web Components标准来构建高效、现代的Web应用，还能了解到这项技术在W3C标准中的位置和发展趋势。对于经验丰富的开发者来说，即使Web组件技术仍处于早期阶段，浏览器支持尚不稳定，但其快速发展速度意味着它是未来的主流方向。《Developing Web Components》正是这样一个实用指南，引导开发者紧跟技术潮流，学会将现有项目进行组件化改造，以便更好地适应现代Web开发环境。该书得到了来自行业专家的认可，Addy Osmani，Google的Chrome和Polymer工程师，高度评价了作者们对新手的指导价值，表示这是一本帮助开发者入门组件化Web开发的重要资源。同样，Rob Dodson，Google的开发者倡导者，也表达了对本书的热情推荐，认为它对于引导开发者探索组件化之路非常有帮助。《Developing Web Components 2015.2》是一本适合初级至进阶开发者阅读的实战教材，它不仅涵盖了Web组件的基础知识，还提供了实际操作技巧，帮助读者在快速变化的Web技术环境中，把握住Web组件开发的脉络和最佳实践。”

If you are already familiar with these patterns or you would prefer to dive right into

the meat of web components, then start with Part III.

Part III, Building HTML5 Web Components

The third section provides an introduction to web components as defined by the

World Wide Web Consortium (W3C) and implemented by browsers. This section

takes the working example built in and and converts it into a fully functioning

web component.

Part IV, Testing, Building, and Deploying Components with Polymer

The fourth section covers how Google’s Polymer bridges the web component imple‐

mentation gaps in today’s browsers and provides convenient APIs for creating

extendable web components. It then guides you through converting your web compo‐

nent from Part III into a Polymer component. Finally, it shows how to package

and deploy the raw web component and the Polymerized version using different

package managers.

What This Book Isn’t

The intent of this book is not to be the definitive guide for developing web compo‐

nents across the entire spectrum of devices used to access the Internet. That would be

an impossible endeavor, for two key reasons.

First, the capabilities of the browser have increased significantly in recent years, and

the Internet has transformed from a document delivery mechanism into a quasi

application platform. This transformation has made the browser a much more robust

and feature-rich platform than I ever imagined possible back when I was using tables

to lay out pages and testing them in Netscape 4. There are now many new techniques

for achieving what would have been spectacular feats of JavaScript pixel pushing

using CSS alone. These native features continuously evolve, but are adopted at differ‐

ing rates by browser vendors. Implementation varies across browsers as well, because

browser vendors base their implementations on their own interpretations of the W3C

specifications. These features are very relevant to web component development, but

this brave new browser world is a book topic in its own right. Inclusion of this level

of detail is out of scope. While it is very relevant, it is not required for web compo‐

nent development.

Secondly, the number of device types and vendors—smartphones, tablets, phablets,

etc.—has increased significantly over the past five years. This proliferation of new

devices and manufacturers has reintroduced limitations that we assumed were issues

of the past: limited processing power, limited memory, smaller form factors, poor

network connectivity, etc. This influx of new devices has impacted web development

xiv | Preface

I would also like to thank my manager, Claude Jones, for his guidance and help.

Without it, this book would not exist.

I would like to thank my coauthor Jarrod Overson for agreeing to step in and write

Part IV. If you sometimes think you’re faking it, then I am doomed, as you are defi‐

nitely a more gifted writer, speaker, and engineer than me.

Many thanks to Simon St.Laurent for hearing out my half-baked idea, and providing

the feedback that shaped it into an acceptable book proposal. Also, my editor Brian

Anderson is the most patient person I have ever known. Without him this book

would be nothing more than the inner workings of my mind without context and

would not be understood by anyone expect myself. Thank you Brian.

Finally, I would like to thank all the silent partners—the engineers who write much

better code than I ever will and have taught me innumerable lessons. They choose to

remain out of the public eye, but if you are lucky enough run across one of them in

your career—trust me, you will know it— then listen to them. It is because of these

silent partners that I am even passable at best for an engineer and that I am able to

share what little knowledge I do posses.

Jarrod Overson

None of my work would have been possible without the support and patience of my

wife, Kate Lane. For years now she has accommodated my ramblings about

JavaScript, particles, and physics simulations while always being supportive and moti‐

vating. Thank you for giving me the opportunities to speak abroad, code into the

night, and spend far too much time organizing community events. Without your

support none of what I have now would have been possible, including my two beauti‐

ful children.

Thank you Finn, for bringing so much joy into my life. All of your great ideas leave

me amazed and thrilled to be your father. Thank you Norah, for always being able to

put a smile on my face. Both of you have been my motivation to be a father and per‐

son that you can be proud of.

Finally, thank you, Jason, for thinking of me when putting this book together. You’re

one of San Diego’s best developers and it’s always an honor working with you. I hope

to be able to work with you many more times in the future.

xviii | Preface

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