html {
filter: grayscale(100%);//ie浏览器
-webkit-filter: grayscale(100%);//谷歌浏览器
-moz-filter: grayscale(100%);//火狐
-ms-filter: grayscale(100%);
-o-filter: grayscale(100%);
filter:progid:dximagetransform.microsoft.basicimage(grayscale=1);
-webkit-filter: grayscale(1);//谷歌浏览器
}