We've come a long way since the days of flashing banner ads and scrolling news tickers. Today, the stunning motion design of iOS and Android dramatically improves a user's experience - instead of detracting from it. The best sites and apps of today leverage animation to improve the feel and intuitiveness of their interfaces. Sites without animation are starting to feel antiquated.This book provides you with a technical foundation to implement animation in a way that's both visually stunning and programmatically maintainable. Throughout, we consider the balance between enriching a page with motion design while avoiding unnecessary flourishes
Readers will learn how to design loading sequences that ensure users stay fully engaged instead of tuning out, how to leverage simple physics principles to make apps respond naturally to users' input (just like motion behaves in the real world), how to exploit CSS transforms to create rich depth in animations, and how to fully leverage JavaScript animation libraries like Velocity.js to streamline animation programming. From animation performance to theory, we cover everything needed to become a professional web animator. Whether you're a novice or professional web developer, this book is for everyone.

Why is all of this so important? Why is it worth your time to become a professional motion designer? For the same reason that designers spend hours perfecting their pages' font and color combinations, motion designers perfect their animations' transition and easing combinations: Refined products feel superior. They leave users whispering to themselves, "Wow, this is cool", right before they turn to a friend and exclaim, "You gotta try this."

从闪烁的横幅广告和滚动的新闻标签的时代开始，我们已经走过了很长的路。今天，iOS和安卓系统令人惊叹的动作设计极大地改善了用户的体验--而不是减弱了它。当今最好的网站和应用程序利用动画来改善其界面的感觉和直观性。本书为你提供了一个技术基础，让你以一种视觉上令人惊艳和程序上可维护的方式来实现动画。在整个过程中，我们考虑了如何在用动作设计丰富页面的同时避免不必要的装饰之间取得平衡。

读者将学习如何设计加载序列，以确保用户保持充分的参与，而不是调出，如何利用简单的物理原理，使应用程序对用户的输入作出自然的反应（就像运动在现实世界中的表现），如何利用CSS变换来创建丰富的动画深度，以及如何充分利用JavaScript动画库（如Velocity.js）来简化动画编程。从动画性能到理论，我们涵盖了成为一个专业的网络动画师所需要的一切。无论你是新手还是专业的网络开发者，这本书都是为大家准备的。

为什么所有这些都如此重要？为什么值得你花时间去成为一个专业的动作设计师？就像设计师花几个小时完善他们页面的字体和颜色组合一样，动作设计师也要完善他们动画的过渡和缓和组合。精致的产品给人以优越感。他们让用户对自己低声说："哇，这太酷了"，就在他们转向朋友并感叹 "你得试试这个 "之前。