css3出现之前，我们实现一个对象的一组连续动画需要通过JavaScript或Jquery编写，脚本代码较为复杂；
若需要实现倾斜、旋转之类的动画难度将更高（我还没试过用JavaScript或Jquery如何实现），而且即使能实现估计花的时间代价及维护难度是很大的，很多时候只能依靠画图工具制作此类动画文件；
有时候在想如果不用脚本语言，也不用画图工作制作动画文件，就能在网页上实现倾斜、旋转之类的动画效果多好。
最近挤出一些业余时间学习CSS3，其中就包含很多动画示例，花了点时间学习和整理
今天分享使用html+css3实现skew倾斜、rotate旋转动画，我们先看最终效果图（我这里为了演示效果，就用QQ屏幕截成多张图片，然后制作成gif动画给大家简单展示下，效果不好请大家多多包涵）
图1
具体步骤如下：
1、放置两个div，一个作为容器（图1中绿色背景部分 id="warp"），另一个作为动画元素（图1中黄色背景部分 id="box"）
HTML代码：
<div id="warp"> <div id="box">WEB</div></div>
CSS代码（设置容器及动画元素默认样式）：
#warp { width: 320px; height: 320px; background: #6FDE82; margin: 20px auto;}#box { height: 40px; width: 40px; background: yellow; position: relative; top: 280px; left: 0; } 注意：#box{position: relative;}是为该元素接下来做动画做准备，因为动画过程中需要改变其位置，故这里使用相对定位
上述代码为基本的html css，大家应该没问题吧
此时效果如下：
2、使用CSS3 @keyframes自定义动画
CSS代码：
@keyframes move { 0% { top: 280px; left: 0; transform: skewX(0deg); width: 40px; height: 40px; } 20% { top: 0; left: 0; transform: skewX(50deg); width: 60px; height: 20px; background: red; } 22% { top: 0; left: 0; transform: skewX(0deg); width: 40px; height: 40px; } 30% { top: 0; left: 0; transform: skewX(0deg); width: 320px; height: 40px; } 40% { top: 0; left: 280px; transform: skewX(0deg); width: 40px; height: 40px; background: green; } 50% { top: 0; left: 280px; transform: skewX(0deg); width: 20px; height: 320px; } 55% { top: 280px; left: 280px; transform: skewX(0deg); width: 40px; height: 40px; background: blue; } 60% { transform: rotate(-90deg); transform-origin: left bottom; } 65% { transform: rotate(-180deg); transform-origin: left top; }} 代码解析：
css3自定义动画需要使用@keyframes规则，具体请看CSS3 @keyframes 规则
-
设置动画执行进度
本示例中定义了 0% 20% 22% 30% 40% 50% 55% 60% 65%几个动画进度，
百分比到底代表什么意思？
举例说明：如果整个动画执行10秒，那么20%就代表当动画执行到2秒时的效果。所以整个自定义动画翻译过来就是在每个执行进度中定义css样式（比如 width，height，color等），这样就形成了连贯的动画效果。执行进度百分比根据实际情况可自行调整。
注意：该执行进度并非一定要设置100%，如本示例中仅设置到65%，这就意味着剩下的35%就由css3自行完成动画回归到原始状态（大家可以试试）
-
元素倾斜（元素变形）、旋转（元素不变形）
本示例中用到倾斜及旋转动画，倾斜使用skew()，参数为倾斜度数；旋转使用rotate()，参数为旋转度数；
倾斜原理示意图如下：
X轴逆时针转为正；Y轴顺时针转为正；
举例：
skew(30deg),在本示例中效果将成这样
skew(-30deg),在本示例中效果将成这样
Y轴的这里就不举例了，根据上述提示大家可自行测试效果
transform-origin，元素倾斜或转动中心点，具体属性值可看CSS3 transform-origin 属性
这里的中心点，指的是动画元素的中心点，元素围绕该点转动或倾斜，该点坐标是不会改变的；个人觉得这里需要头脑中产生一些几何图形以便于理解，或者用一张纸（手机之类的物品）放在桌子上，用手固定该物品的某个点演示一下转动效果，就明白了
3、执行自定义动画
CSS代码：
#box { height: 40px; width: 40px; background: yellow; position: relative; top: 280px; left: 0; animation: move 5s infinite;}
代码解析：
animation: move 5s infinite;
代表该自定义动画完成耗时5秒，并且无限循环执行
animation属性的详细说明请看这里CSS3 animation（动画） 属性
OK，上述步骤及原理大家都清楚了吧。本示例完整代码如下，各位可以直接复制去执行看看效果
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>HTML5+CSS3 skew倾斜、rotate旋转动画</title> <style type="text/css"> #warp { width: 320px; height: 320px; background: #6FDE82; margin: 20px auto; } #box { height: 40px; width: 40px; background: yellow; position: relative; top: 280px; left: 0; animation: move 5s infinite; } @keyframes move { 0% { top: 280px; left: 0; transform: skewX(0deg); width: 40px; height: 40px; } 20% { top: 0; left: 0; transform: skewX(50deg); width: 60px; height: 20px; background: red; } 22% { top: 0; left: 0; transform: skewX(0deg); width: 40px; height: 40px; } 30% { top: 0; left: 0; transform: skewX(0deg); width: 320px; height: 40px; } 40% { top: 0; left: 280px; transform: skewX(0deg); width: 40px; height: 40px; background: green; } 50% { top: 0; left: 280px; transform: skewX(0deg); width: 20px; height: 320px; } 55% { top: 280px; left: 280px; transform: skewX(0deg); width: 40px; height: 40px; background: blue; } 60% { transform: rotate(-90deg); transform-origin: left bottom; } 65% { transform: rotate(-180deg); transform-origin: left top; } } </style> </head> <body> <div id="warp"> <div id="box">WEB</div> </div> </body></html>
好了，今天分享就到这里，以后还有更多哟，请大家一起来交流下，有兴趣的朋友给我的文章评论下嘛
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