CSS 4.2.4参考手册
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本文档使用 php.cn手册 发布

文字

语法：

@keyframes <identifier> { <keyframes-blocks> }

<keyframes-blocks>：[ [ from | to | <percentage> ]{ sRules } ] [ [ , from | to | <percentage> ]{ sRules } ]*

取值：

  • <identifier>：identifier定义一个动画名称

  • <keyframes-blocks>：定义动画在每个阶段的样式，即帧动画。

说明：

指定动画名称和动画效果。

  • @keyframes定义的动画名称用来被animation-name所使用。

  • 定义动画时，简单的动画可以直接使用关键字from和to，即从一种状态过渡到另一种状态：

    示例代码：

    @keyframes testanimations { from { opacity: 1; } to { opacity: 0; } }

    其中testanimations是该动画的名字，该动画表示某个东西将逐渐消失。

  • 如果复杂的动画，可以混合<percentage>去设置某个时间段内的任意时间点的样式：

    示例代码：

    @keyframes testanimations { from { transform: translate(0, 0); } 20% { transform: translate(20px, 20px); } 40% { transform: translate(40px, 0); } 60% { transform: translate(60px, 20); } 80% { transform: translate(80px, 0); } to { transform: translate(100px, 20px); } }

  • 当然，也可以不使用关键字from和to，而都使用<percentage>：

    示例代码：

    @keyframes testanimations{ 0% { transform: translate(0, 0); } 20% { transform: translate(20px, 20px); } 40% { transform: translate(40px, 0); } 60% { transform: translate(60px, 20px); } 80% { transform: translate(80px, 0); } 100% { transform: translate(100px, 20px); } }

    注意，这里的0%不能简写成0，0是非标准语法（虽然被某些浏览器所支持）。

兼容性：

IEFirefoxChromeSafariOperaiOS SafariAndroid BrowserAndroid Chrome
6.0-9.02.0-4.04.0-43.0
-webkit-		3.1-3.215.0-29.0
-webkit-		3.2-8.1
-webkit-		2.1-3.0
-webkit-		18.0-40.0
-webkit-
10.0+5.0-15.0
-moz-		4.0-8.1
-webkit-		4.0+
-webkit-
16.0

示例：

实例

<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8" />
<title>@keyframes_CSS参考手册_web前端开发参考手册系列</title>
<meta name="author" content="Joy Du(飘零雾雨), dooyoe@gmail.com, www.doyoe.com" />
<style>
#sport{position:relative;width:500px;height:400px;border:1px solid #ddd;}
#staff{position:absolute;z-index:3;bottom:10px;left:10px;overflow:hidden;width:180px;height:8px;border-radius:3px;background:#ddd;line-height:20;
	-webkit-animation:staff 3s linear;
	animation:staff 3s linear;
}
#ball{position:absolute;z-index:3;bottom:20px;left:90px;overflow:hidden;width:30px;height:30px;border-radius:15px;box-shadow:0 0 10px rgba(204,102,0,.8);background:#F6D66E;background:linear-gradient(top,#fff,#F6D66E);line-height:20;
	-webkit-animation:ball 3s linear;
	animation:ball 3s linear;
}
@-webkit-keyframes ball{
	0%{-webkit-transform:translate(0,0);}
	5%{-webkit-transform:translate(-90px,-100px);}
	18%{-webkit-transform:translate(0,-350px);}
	35%{-webkit-transform:translate(200px,0);}
	46%{-webkit-transform:translate(380px,-160px);}
	60%{-webkit-transform:translate(250px,-350px);}
	78%{-webkit-transform:translate(60px,0);}
	100%{-webkit-transform:translate(0,0);}
}
@keyframes ball{
	0%{transform:translate(0,0);}
	5%{transform:translate(-90px,-100px);}
	18%{transform:translate(0,-350px);}
	35%{transform:translate(200px,0);}
	46%{transform:translate(380px,-160px);}
	60%{transform:translate(250px,-350px);}
	78%{transform:translate(60px,0);}
	100%{transform:translate(0,0);}
}
@-webkit-keyframes staff{
	0%{-webkit-transform:translate(0,0);}
	6%{-webkit-transform:translate(260px,0);}
	20%{-webkit-transform:translate(300px,0);}
	30%{-webkit-transform:translate(300px,0);}
	40%{-webkit-transform:translate(200px,0);}
	65%{-webkit-transform:translate(40px,0);}
	79%{-webkit-transform:translate(0,0);}
	100%{-webkit-transform:translate(0,0);}
}
@keyframes staff{
	0%{transform:translate(0,0);}
	6%{transform:translate(260px,0);}
	20%{transform:translate(300px,0);}
	30%{transform:translate(300px,0);}
	40%{transform:translate(200px,0);}
	65%{transform:translate(40px,0);}
	79%{transform:translate(0,0);}
	100%{transform:translate(0,0);}
}
</style>
</head>
<body>
<div id="sport">
	<span id="ball">弹球</span>
	<span id="staff">滑杆</span>
</div>
</body>
</html>

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