代码1:

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

代码2:

html { filter:progidXImageTransform.Microsoft.BasicImage(grayscale=1); } 

代码3:

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);} 

说明:

1.请在头部加载.
2.可用 js 异步加载也一样的