rfc2936.txt

283个中文RFC文档

  //     is_nav, is_ie, is_opera
  // (2) browser version number:
  //     is_major (integer indicating major version number: 2, 3, 4 ...)
  //     is_minor (float   indicating full  version number:
  //                                               2.02, 3.01, 4.04 ...)
  // (3) browser vendor AND major version number
  //     is_nav2, is_nav3, is_nav4, is_nav4up, is_nav5, is_nav5up,
  //     is_ie3, is_ie4, is_ie4up
  // (4) JavaScript version number:
  //     is_js (float indicating full JavaScript version number:
  //                                                    1, 1.1, 1.2 ...)
  // (5) OS platform and version:
  //     is_win, is_win16, is_win32, is_win31,
  //     is_win95, is_winnt, is_win98
  //     is_os2
  //     is_mac, is_mac68k, is_macppc
  //     is_unix
  //        is_sun, is_sun4, is_sun5, is_suni86
  //        is_irix, is_irix5, is_irix6
  //        is_hpux, is_hpux9, is_hpux10
  //        is_aix, is_aix1, is_aix2, is_aix3, is_aix4
  //        is_linux, is_sco, is_unixware, is_mpras, is_reliant
  //        is_dec, is_sinix, is_freebsd, is_bsd
  //     is_vms
  //
  // See http://www.it97.de/JavaScript/JS_tutorial/bstat/navobj.html and
  // http://www.it97.de/JavaScript/JS_tutorial/bstat/Browseraol.html
  // for detailed lists of userAgent strings.
  //
  // Note: you don't want your Nav4 or IE4 code to "turn off" or
  // stop working when Nav5 and IE5 (or later) are released, so
  // in conditional code forks, use is_nav4up ("Nav4 or greater")
  // and is_ie4up ("IE4 or greater") instead of is_nav4 or is_ie4
  // to check version in code which you want to work on future
  // versions.

  // convert all characters to lowercase to simplify testing
  var agt=navigator.userAgent.toLowerCase();

  // *** BROWSER VERSION ***
  // Note: On IE5, these return 4, so use is_ie5up to detect IE5.
  var is_major = parseInt(navigator.appVersion);
  var is_minor = parseFloat(navigator.appVersion);

  // Note: Opera and WebTV spoof Navigator.  We do strict client
  //  detection.  If you want to allow spoofing, take out the tests
  //  for opera and webtv.
  var is_nav  = ((agt.indexOf('mozilla')!=-1)
              && (agt.indexOf('spoofer')==-1)
              && (agt.indexOf('compatible') == -1)
              && (agt.indexOf('opera')==-1)
              && (agt.indexOf('webtv')==-1));
  var is_nav2 = (is_nav && (is_major == 2));
  var is_nav3 = (is_nav && (is_major == 3));
  var is_nav4 = (is_nav && (is_major == 4));
  var is_nav4up = (is_nav && (is_major >= 4));
  var is_navonly      = (is_nav && ((agt.indexOf(";nav") != -1) ||
                        (agt.indexOf("; nav") != -1)) );
  var is_nav5 = (is_nav && (is_major == 5));
  var is_nav5up = (is_nav && (is_major >= 5));

  var is_ie   = (agt.indexOf("msie") != -1);
  var is_ie3  = (is_ie && (is_major < 4));
  var is_ie4  = (is_ie && (is_major == 4)
                       && (agt.indexOf("msie 5.0")==-1) );
  var is_ie4up  = (is_ie  && (is_major >= 4));
  var is_ie5  = (is_ie && (is_major == 4)
                       && (agt.indexOf("msie 5.0")!=-1) );
  var is_ie5up  = (is_ie  && !is_ie3 && !is_ie4);

  // KNOWN BUG: On AOL4, returns false if IE3 is embedded browser
  // or if this is the first browser window opened.  Thus the
  // variables is_aol, is_aol3, and is_aol4 aren't 100% reliable.
  var is_aol   = (agt.indexOf("aol") != -1);
  var is_aol3  = (is_aol && is_ie3);
  var is_aol4  = (is_aol && is_ie4);

  var is_opera = (agt.indexOf("opera") != -1);
  var is_webtv = (agt.indexOf("webtv") != -1);

  // *** JAVASCRIPT VERSION CHECK ***
  var is_js;
  if (is_nav2 || is_ie3) is_js = 1.0
  else if (is_nav3 || is_opera) is_js = 1.1

  else if ((is_nav4 && (is_minor <= 4.05)) || is_ie4) is_js = 1.2
  else if ((is_nav4 && (is_minor > 4.05)) || is_ie5) is_js = 1.3
  else if (is_nav5) is_js = 1.4
  // NOTE: In the future, update this code when newer versions of JS
  // are released. For now, we try to provide some upward compatibility
  // so that future versions of Nav and IE will show they are at
  // *least* JS 1.x capable. Always check for JS version compatibility
  // with > or >=.
  else if (is_nav && (is_major > 5)) is_js = 1.4
  else if (is_ie && (is_major > 5)) is_js = 1.3
  // HACK: no idea for other browsers;
  //       always check for JS version with > or >=
  else is_js = 0.0;

  // *** PLATFORM ***
  var is_win   = ( (agt.indexOf("win")!=-1) ||
                   (agt.indexOf("16bit")!=-1) );
  // NOTE: On Opera 3.0, the userAgent string includes "Windows 95/NT4"
  // on all Win32, so you can't distinguish between Win95 and WinNT.
  var is_win95 = ((agt.indexOf("win95")!=-1) ||
                  (agt.indexOf("windows 95")!=-1));

  // is this a 16 bit compiled version?
  var is_win16 = ((agt.indexOf("win16")!=-1) ||
             (agt.indexOf("16bit")!=-1) ||
             (agt.indexOf("windows 3.1")!=-1) ||
             (agt.indexOf("windows 16-bit")!=-1) );

  var is_win31 = ((agt.indexOf("windows 3.1")!=-1) ||
                  (agt.indexOf("win16")!=-1) ||
                  (agt.indexOf("windows 16-bit")!=-1));

  // NOTE: Reliable detection of Win98 may not be possible.
  // It appears that:
  //  - On Nav 4.x and before you'll get plain "Windows" in userAgent.
  //  - On Mercury client, the 32-bit version will return "Win98", but
  //    the 16-bit version running on Win98 will still return "Win95".
  var is_win98 = ((agt.indexOf("win98")!=-1) ||
                  (agt.indexOf("windows 98")!=-1));
  var is_winnt = ((agt.indexOf("winnt")!=-1) ||
                  (agt.indexOf("windows nt")!=-1));
  var is_win32 = (is_win95 || is_winnt || is_win98 ||
                  ((is_major >= 4) &&
                   (navigator.platform == "Win32")) ||
                  (agt.indexOf("win32")!=-1) ||
                  (agt.indexOf("32bit")!=-1));

  var is_os2   = ((agt.indexOf("os/2")!=-1) ||

                  (navigator.appVersion.indexOf("OS/2")!=-1) ||
                  (agt.indexOf("ibm-webexplorer")!=-1));

  var is_mac    = (agt.indexOf("mac")!=-1);
  var is_mac68k = (is_mac && ((agt.indexOf("68k")!=-1) ||
                             (agt.indexOf("68000")!=-1)));
  var is_macppc = (is_mac && ((agt.indexOf("ppc")!=-1) ||
                              (agt.indexOf("powerpc")!=-1)));

  var is_sun   = (agt.indexOf("sunos")!=-1);
  var is_sun4  = (agt.indexOf("sunos 4")!=-1);
  var is_sun5  = (agt.indexOf("sunos 5")!=-1);
  var is_suni86= (is_sun && (agt.indexOf("i86")!=-1));
  var is_irix  = (agt.indexOf("irix") !=-1);    // SGI
  var is_irix5 = (agt.indexOf("irix 5") !=-1);
  var is_irix6 = ((agt.indexOf("irix 6") !=-1) ||
                  (agt.indexOf("irix6") !=-1));
  var is_hpux  = (agt.indexOf("hp-ux")!=-1);
  var is_hpux9 = (is_hpux && (agt.indexOf("09.")!=-1));
  var is_hpux10= (is_hpux && (agt.indexOf("10.")!=-1));
  var is_aix   = (agt.indexOf("aix") !=-1);      // IBM
  var is_aix1  = (agt.indexOf("aix 1") !=-1);
  var is_aix2  = (agt.indexOf("aix 2") !=-1);
  var is_aix3  = (agt.indexOf("aix 3") !=-1);
  var is_aix4  = (agt.indexOf("aix 4") !=-1);
  var is_linux = (agt.indexOf("inux")!=-1);
  var is_sco   = (agt.indexOf("sco")!=-1) ||
                 (agt.indexOf("unix_sv")!=-1);
  var is_unixware = (agt.indexOf("unix_system_v")!=-1);
  var is_mpras    = (agt.indexOf("ncr")!=-1);
  var is_reliant  = (agt.indexOf("reliantunix")!=-1);
  var is_dec   = ((agt.indexOf("dec")!=-1) ||
         (agt.indexOf("osf1")!=-1) ||
         (agt.indexOf("dec_alpha")!=-1) ||
         (agt.indexOf("alphaserver")!=-1) ||
         (agt.indexOf("ultrix")!=-1) ||
         (agt.indexOf("alphastation")!=-1));
  var is_sinix = (agt.indexOf("sinix")!=-1);
  var is_freebsd = (agt.indexOf("freebsd")!=-1);
  var is_bsd = (agt.indexOf("bsd")!=-1);
  var is_unix  = ((agt.indexOf("x11")!=-1) || is_sun ||
               is_irix || is_hpux ||
               is_sco ||is_unixware || is_mpras || is_reliant ||
               is_dec || is_sinix || is_aix || is_linux ||
               is_bsd || is_freebsd);

  var is_vms   = ((agt.indexOf("vax")!=-1) ||
                  (agt.indexOf("openvms")!=-1));

  </SCRIPT>

作者地址：

   Donald E. Eastlake 3rd
   Motorola
   140 Forest Avenue
   Hudson, MA 01749 USA

   Phone: [phone](h)
          [phone](w)
   Fax:   [phone](w)
   EMail: [e-mail]

   Chris J. Smith
   Royal Bank of Canada
   277 Front Street West
   Toronto, Ontario M5V 3A4 CANADA

   Phone: [phone]
   Fax:   [phone]
   EMail: [e-mail]

   David M. Soroka
   IBM
   Raleigh, NC

   Phone: [phone]
   Fax:   [phone]
   EMail: [e-mail]

版权说明：
   Copyright (C) The Internet Society (2000).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
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   or assist in its implementation may be prepared, copied, published
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   kind, provided that the above copyright notice and this paragraph are
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   The limited permissions granted above are perpetual and will not be
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   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
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致谢
Funding for the RFC Editor function is currently provided by the Internet Society.
RFC2936——HTTP MIME Type Handler Detection             HTTP 多用途网际邮件扩充
协议(MIME)类型处理器检测                           


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