打开
/etc/lighttpd/lighttpd.conf
查找 
#### compress module
#compress.cache-dir         = "/tmp/lighttpd/cache/compress/"
#compress.filetype          = ("text/plain", "text/html")  
把前面的注释符号去掉. 需要压缩的文件类型添加在compress.filetype 里
#### compress module
compress.cache-dir         = "/tmp/lighttpd/cache/compress/"
compress.filetype          = ("text/plain", "text/html", "text/javascript", "text/css", "text/javascript")  
重启lighttpd
/etc/init.d/lighttpd restart
service lighttpd restart 
compress.filetype文件对应类型如下:
  ".pdf"          =>      "application/pdf",
  ".sig"          =>      "application/pgp-signature",
  ".spl"          =>      "application/futuresplash",
  ".class"        =>      "application/octet-stream",
  ".ps"           =>      "application/postscript",
  ".torrent"      =>      "application/x-bittorrent",
  ".dvi"          =>      "application/x-dvi",  
  ".gz"           =>      "application/x-gzip",
  ".pac"          =>      "application/x-ns-proxy-autoconfig",
  ".swf"          =>      "application/x-shockwave-flash",
  ".tar.gz"       =>      "application/x-tgz",
  ".tgz"          =>      "application/x-tgz",
  ".tar"          =>      "application/x-tar",
  ".zip"          =>      "application/zip",