网页滤镜，全站黑白

代码简便，只需要在css中加入以下代码

html{
      -webkit-filter: grayscale(100%);-moz-filter: grayscale(100%);-ms-filter: grayscale(100%);-o-filter: grayscale(100%);filter: grayscale(100%);filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
    }