var myLibs = {

     // Use of jQuery.browser is frowned upon.

     // More details: http://api.jquery.com/jQuery.browser

     // jQuery.uaMatch maintained for back-compat

     browser:(function(){

         var uaMatch = function(ua){

             ua = ua.toLowerCase();

             var match = /(chrome)[ \/]([\w.]+)/.exec( ua ) ||

                 /(webkit)[ \/]([\w.]+)/.exec( ua ) ||

                 /(opera)(?:.*version|)[ \/]([\w.]+)/.exec( ua ) ||

                 /(msie) ([\w.]+)/.exec( ua ) ||

                 ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec( ua ) ||

                 [];

             return {

                 browser: match[ 1 ] || "",

                 version: match[ 2 ] || "0"

             };

         };

         var matched = uaMatch(navigator.userAgent),

             browser = {};

         if (matched.browser){

             browser[matched.browser] = true;

             browser.version = matched.version;

         }

         // Chrome is Webkit, but Webkit is also Safari.

         if (browser.chrome){

             browser.webkit = true;

         }else if (browser.webkit){

             browser.safari = true;

         }

         return browser;

     })()

 };

 console.log(myLibs.browser.mozilla);//true

 console.log(myLibs.browser.version);//39.0