isAscending Function

function isAscending(number) {
    while (number != 0) {
        if (number%10 < parseInt(number/10)%10) {
            number = parseInt(number/10);
        } else {
            return false;
        }
        return true;
    }
}

if (isAscending(321)) {
    alert("This number is ascending");
} else {
    alert("This number is descending"); // Alert Descending
}

if (isAscending(123)) {
    alert("This number is ascending");  // Alert Ascending
} else {
    alert("This number is descending");
}