纯css页面变灰度兼容ie firefox chrome opera safari

html {

-webkit-filter: grayscale(100%);

-moz-filter: grayscale(100%);

-ms-filter: grayscale(100%);

-o-filter: grayscale(100%);

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

_filter:none;

}