在css里添加


html {

filter: grayscale(100%);

-webkit-filter: grayscale(100%);

-moz-filter: grayscale(100%);

-ms-filter: grayscale(100%);

-o-filter: grayscale(100%);

filter: url("data:image/svg+xml;

utf8,#grayscale");

filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);

-webkit-filter: grayscale(1);

}