把代码加到<head></head>之间，即可直接实现全站灰色效果。
代码如下：
<!–[if IE]>
<style>
html { filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1); }
</style>
<!–<![endif]–>
<!–[if !IE]><–>
<style>
html{
filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
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,<svg xmlns=\”http://www.w3.org/2000/svg\”><filter ….3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\”/></filter></svg>#grayscale”);
filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
filter: gray;
-webkit-filter: grayscale(1);
}
</style>
<!–<![endif]–>
