转自:http://www.cnblogs.com/wangyongx/p/5022529.html
<!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(-5px);} 50%, 100% {-webkit-transform: translateY(0);} 75% {-webkit-transform: translateY(5px);} } @keyframes bounce-down { 25% {transform: translateY(-5px);} 50%, 100% {transform: translateY(0);} 75% {transform: translateY(5px);} } .animate-bounce-down{ background:#333; width: 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; width: 100px; height: 100px; margin:100px auto;-webkit-animation: bounce-up 1.5s linear infinite;animation: bounce-up 1.5s linear infinite;} </style> </head> <body> <div class="animate-bounce-up"></div> <div class="animate-bounce-down"></div> </body> </html>
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原文：http://www.cnblogs.com/cuizhenyu/p/7390379.html
