javascript 判断系统设备

 1 <script>
 2 
 3 function detectOS() { 
 4 var sUserAgent = navigator.userAgent; 
 5 
 6 var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows"); 
 7 var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel"); 
 8 if (isMac) return "Mac"; 
 9 var isUnix = (navigator.platform == "X11") && !isWin && !isMac; 
10 if (isUnix) return "Unix"; 
11 var isLinux = (String(navigator.platform).indexOf("Linux") > -1); 
12 
13 var bIsAndroid = sUserAgent.toLowerCase().match(/android/i) == "android";
14 if (isLinux) {
15 if(bIsAndroid) return "Android";
16 else return "Linux"; 
17 }
18 if (isWin) { 
19 var isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1; 
20 if (isWin2K) return "Win2000"; 
21 var isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || 
22 sUserAgent.indexOf("Windows XP") > -1; 
23 if (isWinXP) return "WinXP"; 
24 var isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1; 
25 if (isWin2003) return "Win2003"; 
26 var isWinVista= sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1; 
27 if (isWinVista) return "Vista"; 
28 var isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1; 
29 if (isWin7) return "Windows 7"; 
30 
31  var isWin8 = sUserAgent.indexOf("Windows NT 6.2") > -1 || sUserAgent.indexOf("Windows 8") > -1;
32 if (isWin8)return "Windows8";
33 } 
34 return "other"; 
35 } 
36 
37 document.writeln("您的操作系统是：" + detectOS()); 
38 alert(detectOS());
39 
40 </script>