<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js判斷客戶端操作系統(tǒng)類型</title>
</head>
<body>
<script language="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 "MacOS";
  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 "Windows2000";
    var isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || sUserAgent.indexOf("Windows XP") > -1;
    if (isWinXP) return "WindowsXP";
    var isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1;
    if (isWin2003) return "Windows2003";
    var isWinVista= sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1;
    if (isWinVista) return "Windows Vista";
    var isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1;
    if (isWin7) return "Windows7";
  }
  return "other";
}
document.writeln("您的操作系統(tǒng)是：" + detectOS());
</script>
</body>
</html>

PS：順便一提的是本站在線工具的IP歸屬地查詢工具中也使用了上述方法來判斷進行用戶操作系統(tǒng)類型判斷。如下：

IP地址歸屬地在線查詢工具：
http://tools.jb51.net/aideddesign/ipcha

順便再為大家推薦幾款比較實用的JS在線格式化工具，相信在以后的開發(fā)中會經(jīng)常用到：

C語言風格/HTML/CSS/json代碼格式化美化工具：
http://tools.jb51.net/code/ccode_html_css_json

在線JavaScript代碼美化、格式化工具：
http://tools.jb51.net/code/js

JavaScript代碼美化/壓縮/格式化/加密工具：
http://tools.jb51.net/code/jscompress

在線JSON代碼檢驗、檢驗、美化、格式化工具：
http://tools.jb51.net/code/json

json代碼在線格式化/美化/壓縮/編輯/轉換工具：
http://tools.jb51.net/code/jsoncodeformat