尝试一下》

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    img {
      -webkit-animation: mymove 7s infinite;
      /* Chrome, Safari, Opera */
      animation: mymove 7s infinite;
    }
    /* Chrome, Safari, Opera */

    @-webkit-keyframes mymove {
      50% {
        -webkit-filter: grayscale(100%);
        filter: grayscale(100%);
      }
    }
    /* Standard syntax */

    @keyframes mymove {
      50% {
        -webkit-filter: grayscale(100%);
        filter: grayscale(100%);
      }
    }
  </style>
</head>
<body>

  <p>逐步改变图片的背景颜色，从黑到白 (100% 灰阶):
    <p>

      <img src="/examples/pineapple.jpg" alt="Pineapple" width="300" height="300">

      <p>filter 属性支持动画效果。</p>
      <p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p>

</body>
</html>
        
尝试一下 》
