function getMobileOperatingSystem() { var userAgent = navigator.userAgent || navigator.vendor || window.opera; if( userAgent.match( /iPad/i ) || userAgent.match( /iPhone/i ) || userAgent.match( /iPod/i ) ) { return 'iOS'; } else if( userAgent.match( /Android/i ) ) { return 'Android'; } else { return 'unknown'; } }
...