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';
}
}
...