Analyzing JS which opens in a client browser

<Script the src = " JS / jQuery-2.2.3.min.js " > </ Script> 
<Script> var Browser = { 
        versions: function () { var U = the navigator.userAgent, 
                App = of navigator.appVersion;
             return { // mobile terminal browser version information 
                Trident: u.indexOf ( ' Trident ' )> - . 1 , // IEs core 
                Presto: u.indexOf ( ' Presto ' )> - . 1 , // Opera kernel
    
            
                WebKit: u.indexOf ( ' AppleWebKit ' )> - 1 , // Apple, Google kernel 
                Gecko: u.indexOf ( ' Gecko ' )> - 1 && u.indexOf ( ' KHTML ' ) == - 1 , // Firefox core 
                mobile: !! u.match (/AppleWebKit.*Mobile * /.), // whether the mobile terminal 
                ios: !! u.match (/ \ ( i [^;] +; (U;) CPU?. the Mac the OS X-+ /), // iOS terminal 
                Android: u.indexOf ( ' the Android ' )> - . 1 || u.indexOf ( 'Linux ' )> - . 1 , // Android terminal uc browser or 
                iPhone: u.indexOf ( ' iPhone ' )> - . 1 , // whether the browser for the iPhone or QQHD 
                the iPad: u.indexOf ( ' the iPad ' )> - 1 , // whether the iPad 
                webApp: u.indexOf ( ' Safari ' ) == - 1  // if the web application should not bottom head 
            }; 
        } (), 
        Language: (navigator.browserLanguage || navigator.language) .toLowerCase () 
    } 
    $ ( ' #Download ' ) .on ( ' the Click ' , function () {
         IF (browser.versions.mobile) { // determines whether the mobile device is opened in the following code .browser 
            var UA = navigator.userAgent.toLowerCase () ; // get the object is determined by the 
            IF (ua.match (/ MicroMessenger / I) == " micromessenger " ) { 
                the console.log ( ' micro-channel browser opens ' ) 
            } the else  IF (ua.match (/ weibo / I) == " Weibo " ) { 
                the console.log ( ' social client opens') 
            } The else  IF (ua.match (/ QQ / I) == " QQ " ) { 
                the console.log ( ' QQ client opens ' ) 
            } the else  IF (browser.versions.ios) { 
                the console.log ( ' the IOS browsing open ' ) 
            } the else  IF (browser.versions.android) { 
                the console.log ( ' Andrews browser opens ' ) 
            } 
        } the else { 
            the console.log ( ' the PC browser opens ')
        }
    })
</script>

The company's business requirements to determine where to open the browser to perform other business operations, bitter little rookie, I write it down down