网站变灰

js自己去找
 
<script src="grayscale.js" type="text/javascript"></script>
<script type="text/javascript">
var browserName = navigator.userAgent.toLowerCase();
var mybrowser = {
version: (browserName.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [0, '0'])[1],
safari: /webkit/i.test(browserName) && !this.chrome,
opera: /opera/i.test(browserName),
firefox:/firefox/i.test(browserName),
ie: /msie/i.test(browserName) && !/opera/.test(browserName),
mozilla: /mozilla/i.test(browserName) && !/(compatible|webkit)/.test(browserName) && !this.chrome,
chrome: /chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName)
}
 
if(mybrowser.mozilla || mybrowser.safari || mybrowser.opera){
window.onload=function(){ 
grayscale(document.body); 
}
}
</script type="text/css">
<style>
html{
filter: grayscale(100%);
-webkit-filter: grayscale(100%);
-moz-filter: grayscale(100%);
-ms-filter: grayscale(100%);
-o-filter: grayscale(100%);
filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
-webkit-filter: grayscale(100%);
}
</style>

另外一种不用js的，兼容firefox的

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);
}