CSS动画：旋转卡片效果

<!DOCTYPE html>
<html>
<head>
    <title>demo</title>
</head>
<body>
    <style type="text/css">
        @-webkit-keyframes rotate{
            from{-webkit-transform:rotateY(0);}
            to{-webkit-transform:rotateY(-360deg);}
        }
        @keyframes rotate{
            from{-webkit-transform:rotateY(0);}
            to{-webkit-transform:rotateY(-360deg);}
        }
        .rect{
            width: 200px;
            height: 200px;
            margin: 0 auto;
            border-radius: 5px;
            border: 1px solid #ccc;
            font-size: 125pt;
            text-align: center;
            line-height: 200px;
            background-color: #bbb;
            opacity: 0.5;
            animation: rotate 8s infinite linear;
            -webkit-animation:rotate 8s infinite linear;
        }
        .rect:hover{
            animation-play-state: paused;
        }
        .stop{
          animation-play-state: paused;
        }
        #control{
          margin: 0 auto;
          text-align: center;
          margin-top: 10px;
        }

    </style>
    <div id="number" class ="rect">6</div>
    <div id="control">
      <button id="run" onclick="frun()">播放</button>
      <button id="pause" onclick="fpause()">暂停</button>
    </div>
    <script type="text/javascript">

    var obj=document.getElementById('number');
      function fpause(){
        if (obj) {
          obj.style.setProperty('animation-play-state',"paused"); 
          //obj.classList.add('stop');//方法二
        }
      }
      function frun(){
        if (obj) {
          obj.style.setProperty('animation-play-state',"running"); 
          //obj.classList.remove('stop');//方法二
        }
       }
    </script>
</body>
</html>
效果展示：