网站全灰色的办法

加滤镜：

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);
}

将上述代码粘贴至任意一全局style

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