将此段css放到<header>标签内即可
<style type=”text/css”>
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,<svg xmlns=\’
http://www.w3.org/2000/svg\’><filter id=\’grayscale\’><feColorMatrix type=\’matrix\’ values=\’0.3333
0.3333 0.3333 0 0 0.3333 0.3333 0.3333 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); –
webkit-filter: grayscale(1);}
</style>