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主要知识点:
@media all and (orientation : landscape) { /* 这是匹配横屏的状态,横屏时的css代码 */}
@media all and (orientation : portrait){ /* 这是匹配竖屏的状态,竖屏时的css代码 */}
animation:
name( keyframe 名称)
duration (规定完成动画所花费的时间,以秒或毫秒计)
timing-function (规定动画的速度曲线)
delay (规定在动画开始之前的延迟)
iteration-count (规定动画应该播放的次数)
direction(规定是否应该轮流反向播放动画)
HTML
<html> <head> <meta charset="UTF-8"> <meta content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no" name="viewport"> <meta content="yes" name="apple-mobile-web-app-capable"> <meta content="black" name="apple-mobile-web-app-status-bar-style"> <meta content="telephone=no" name="format-detection"> <meta content="email=no" name="format-detection"> <title>@keyframes Screen Rotation</title> </head> <body> <div class="cubic"> <img class="oMove" src="http://note.youdao.com/yws/public/resource/5f8d8cc6e6722e4514141c815c87c1b8/803E63652A65490D8B80D1A4AAD902AC"> <p>横屏观看,体验更佳</p> </div> </body> </html>
CSS
	body{
		background-color: #000000;
		color:#fff;
		font-size: 13px;
	}
	.cubic{
		width: 200px;
		height: 200px;
		position: absolute;
           top: 0;
           right:0;
           bottom: 0;
           left: 0;  
           margin:auto;
           text-align: center;
	}
    
    .oMove{
    	/*animation: 
    	name( keyframe 名称) 
    	duration (规定完成动画所花费的时间,以秒或毫秒计)
    	timing-function (规定动画的速度曲线)
    	delay (规定在动画开始之前的延迟)
    	iteration-count (规定动画应该播放的次数)
    	direction(规定是否应该轮流反向播放动画)
    	*/
    	-webkit-animation:oReverse 2.6s infinite 1.0s linear;
    	-webkit-transform:rotate(90deg);
    	animation:reverse 2.6s infinite 1.0s linear;
    	transform:rotate(90deg);
    }
@-webkit-keyframes oReverse{
    0%{-webkit-transform:rotate(90deg);}
    25%{-webkit-transform:translate(0);}
    50%{-webkit-transform:translate(0);}
    100%{-webkit-transform:translate(90deg);}
}
@keyframes oReverse{
    0%{-webkit-transform:rotate(90deg);}
    25%{-webkit-transform:translate(0);}
    50%{-webkit-transform:translate(0);}
    100%{-webkit-transform:translate(90deg);}
}
@media screen and (orientation:landscape){
 /*横屏的时候,动画消失*/
    .cubic{display:none!important}
}
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原文地址:http://www.cnblogs.com/kevinCoder/p/4487583.html