Preface

It wasn’t a long time ago that many JavaScript engineers or, most of the time, web frontend engineers, were still focusing on solving detailed technical issues, such as how to lay out specific content cross-browsers and how to send requests cross-domains.

At that time, a good web frontend engineer was usually expected to have notable experience on how detailed features can be implemented with existing APIs. Only a few people cared about how to write application-scale JavaScript because the interaction on a web page was really simple and no one wrote ASP in JavaScript.

However, the situation has changed tremendously. JavaScript has become the only language that runs everywhere, cross-platform and cross-device. In the main battlefield, interactions ...

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