静态文件不记录日志，配置缓存

vim /usr/local/nginx/conf/vhosts/test.conf

location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
        {
                expires      30d;
                access_log off;
        }
    location ~ .*\.(js|css|static|cache)$
        {
                expires      12h;
                access_log off;
        }

 nginx -t
 nginx -s reload