js识别操作系统以及浏览器版本

 <script type="text/javascript">
     var getOSAndBrowser = function () {
         var os = navigator.platform;
         var userAgent = navigator.userAgent;
         var info = "";
         var tempArray = "";
         //判断操作系统  
         if (os.indexOf("Win") > -1) {
             if (userAgent.indexOf("Windows NT 5.0") > -1) {
                 info += "Win2000";
             } else if (userAgent.indexOf("Windows NT 5.1") > -1) {
                 info += "WinXP";
             } else if (userAgent.indexOf("Windows NT 5.2") > -1) {
                 info += "Win2003";
             } else if (userAgent.indexOf("Windows NT 6.0") > -1) {
                 info += "WindowsVista";
             } else if (userAgent.indexOf("Windows NT 6.1") > -1 || userAgent.indexOf("Windows 7") > -1) {
                 info += "Win7";
             } else if (userAgent.indexOf("Windows NT 6.2") > -1 || userAgent.indexOf("Windows 8") > -1) {
                 info += "Win8";
             } else if (userAgent.indexOf("Windows NT 6.3") > -1 || userAgent.indexOf("Windows 8.1") > -1) {
                 info += "Win8.1";
             } else if (userAgent.indexOf("Windows NT 10.0") > -1 || userAgent.indexOf("Windows 10") > -1) {
                 info += "Win10";
             }
             else {
                info += "Other";
             }
         } else if (os.indexOf("Mac") > -1) {
             info += "Mac";
         } else if (os.indexOf("X11") > -1) {
             info += "Unix";
         } else if (os.indexOf("Linux") > -1) {
             info += "Linux";
         } else {
             info += "Other";
         }
         info += "/";
         //判断浏览器版本  
         var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器  
         var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器  
         var isEdge = userAgent.toLowerCase().indexOf("edge") > -1 && !isIE; //判断是否IE的Edge浏览器  
         var isIE11 = (userAgent.toLowerCase().indexOf("trident") > -1 && userAgent.indexOf("rv") > -1);
         if (/[Ff]irefox(\/\d+\.\d+)/.test(userAgent)) {
             tempArray = /([Ff]irefox)\/(\d+\.\d+)/.exec(userAgent);
             info += tempArray[1] + tempArray[2];
         } else if (isIE) {
             var version = "";
             var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
             reIE.test(userAgent);
             var fIEVersion = parseFloat(RegExp["$1"]);
             if (fIEVersion == 7)
             { version = "IE7"; }
             else if (fIEVersion == 8)
             { version = "IE8"; }
             else if (fIEVersion == 9)
             { version = "IE9"; }
             else if (fIEVersion == 10)
             { version = "IE10"; }
             else
             { version = "0" }
             info += version;
         } else if (isEdge) {
             info += "Edge";
         } else if (isIE11) {
             info += "IE11";
         } else if (/[Cc]hrome\/\d+/.test(userAgent)) {
             tempArray = /([Cc]hrome)\/(\d+)/.exec(userAgent);
             info += tempArray[1] + tempArray[2];
         } else if (/[Vv]ersion\/\d+\.\d+\.\d+(\.\d)* *[Ss]afari/.test(userAgent)) {
             tempArray = /[Vv]ersion\/(\d+\.\d+\.\d+)(\.\d)* *([Ss]afari)/.exec(userAgent);
             info += tempArray[3] + tempArray[1];
         } else if (/[Oo]pera.+[Vv]ersion\/\d+\.\d+/.test(userAgent)) {
             tempArray = /([Oo]pera).+[Vv]ersion\/(\d+)\.\d+/.exec(userAgent);
             info += tempArray[1] + tempArray[2];
         } else {
             info += "unknown";
         }
         return info;
     };
     alert(getOSAndBrowser());  
 </script>