js获取浏览器内核和版本

  <script type="text/javascript">
function Navigator(){
    var Sys = {},
        ua = navigator.userAgent.toLowerCase(),
        s;

        (s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :

        (s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :

        (s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] :

        (s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :

        (s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;

        //以下进行测试
    var appName,appVersion;

        if(Sys.ie){
            appName ="IE";
            appVersion= Sys.ie;
        }

        if(Sys.firefox){
            appName ="Firefox";
            appVersion= Sys.firefox;
        } 

        if(Sys.chrome){
            appName ="Chrome";
            appVersion= Sys.chrome;
        }

        if(Sys.opera){
            appName ="Opera";
            appVersion= Sys.opera;
        } 

        if(Sys.safari){
            appName ="Safari";
            appVersion= Sys.safari;
        } 
       
           //console.log ({"appName":appName ,"appVersion":appVersion})
        return {"appName":appName ,"appVersion":appVersion}

}
        
        Navigator()
    </script>