Js 获取客户端操作系统类型

<script type="text/javascript">
function detectOS() {  
  var sUserAgent = navigator.userAgent;  
  var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");  
  var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel");  
  if (isMac) return "Mac";  
  var isUnix = (navigator.platform == "X11") && !isWin && !isMac;  
  if (isUnix) return "Unix";  
  var isLinux = (String(navigator.platform).indexOf("Linux") > -1);  
  if (isLinux) return "Linux";  
  if (isWin) {  
  var isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1;  
  if (isWin2K) return "Win2000";  
  var isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || 
  sUserAgent.indexOf("Windows XP") > -1;  
  if (isWinXP) return "WinXP";  
  var isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1;  
  if (isWin2003) return "Win2003";  
  var isWinVista= sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1;  
  if (isWinVista) return "WinVista";  
  var isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1;  
  if (isWin7) return "Win7";  
  }  
  return "other";  
}  
document.writeln("您的操作系统是：" + detectOS()); 
</script>