Android or IOS judgment

// determines the type of client 
function deviceType () {
     var U = the navigator.userAgent;
     var isAndroid = u.indexOf ( 'the Android')> -1 || u.indexOf ( 'Adr')> -1; // Android Andrews 
    var isiOS u.match !! = (/ \ (I [^;] +; (the U-;?) the CPU the Mac the OS X-+ /);. // iOS Apple 
    IF (isAndroid) {
         return "the Android" 
    } the else  IF (isiOS) {
         return "of Ios" 
    } 
}