<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
@-webkit-keyframes bounce-down {
25% {-webkit-transform: translateY(-10px);}
50%, 100% {-webkit-transform: translateY(0);}
75% {-webkit-transform: translateY(10px);}
}
@keyframes bounce-down {
25% {transform: translateY(-10px);}
50%, 100% {transform: translateY(0);}
75% {transform: translateY(10px);}
}
.animate-bounce-down{ background:#333; 100px; height: 100px; margin:100px auto;-webkit-animation: bounce-down 1.5s linear infinite;animation: bounce-down 1.5s linear infinite;
}
@-webkit-keyframes bounce-up {
25% {-webkit-transform: translateY(10px);}
50%, 100% {-webkit-transform: translateY(0);}
75% {-webkit-transform: translateY(-10px);}
}
@keyframes bounce-up {
25% {transform: translateY(10px);}
50%, 100% {transform: translateY(0);}
75% {transform: translateY(-10px);}
}
.animate-bounce-up{ background:#ddd; 100px; height: 100px; margin:100px auto;-webkit-animation: bounce-up 1.4s linear infinite;animation: bounce-up 1.4s linear infinite;}
</style>
</head>
<body>
<div class="animate-bounce-up"></div>
<div class="animate-bounce-down"></div>
</body>
</html>
来源：https://www.cnblogs.com/wangyongx/p/5022529.html