响应号召，页面变灰(方法转自张宴博客)

步骤如下：
　　1、重新编译Nginx，增加http_sub_module模块：
wget https://nginx.org/download/nginx-0.8.39.tar.gz
tar zxvf nginx-0.8.39.tar.gz
cd nginx-0.8.39
./configure –user=www –group=www –prefix=/usr/local/webserver/nginx –with-http_stub_status_module –with-http_ssl_module –with-http_sub_module
make && make install
pkill -9 nginx
/usr/local/webserver/nginx/sbin/nginx

在nginx.conf配置文件的http {…}大括号内增加以下两行：
sub_filter  ‘</head>’  ‘<style type="text/css">html {filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1); }</style></head>’;
sub_filter_once on;

保存后，重新加载配置文件：
/usr/local/webserver/nginx/sbin/nginx -t
/usr/local/webserver/nginx/sbin/nginx -s reload

如果某些带有Flash的页面仍显示彩色，或浏览器上下滚动条拖动时Flash FLV播放器变花（例如剑网3、剑侠世界官网分流页），将Flash改为JS输出（本例为SWFObject）：
<script type="text/javascript" src="https://v.xoyo.com/site/v.xoyo.com/web/js/swf.js”></script&gt;
<div id="video_content"></div>
<script type="text/javascript">
<!–
    var video_player_so = new SWFObject("https://api.v.xoyo.com/external/player.swf?autostart=true&config=https://api.v.xoyo.com/external/video-542.swf", "sotester", "439", "246", "7");
    video_player_so.addParam("wmode", "opaque");
    video_player_so.addParam("allowfullscreen","true");
    video_player_so.addParam("allowscriptaccess","always");
    video_player_so.write("video_content");
//–>
</script>