css动画--元素上下跳动

在H5场景动画时，常常会用到着一样一个效果，箭头持续上下跳动来引导用户上下滑动整个页面

<!DOCTYPE html >

<html>

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

        <title>css动画--元素上下跳动</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; 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 1.4s 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>

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css动画--元素上下跳动

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