JavaScript method to convert numbers into uppercase integer amounts_javascript skills

function digit_uppercase(n) {
var digit = [
'zero', 'one', 'two', 'three', 'four',
'五', 'LU', '旒', '捌', '玖'
];
var unit = [
['yuan', 'wan', 'hundred million'],
['', '十', 'hundred', '千']
];

var s = '';
for (var i = 0; i < unit[0].length && n > 0; i ) {
var p = '';
for (var j = 0; j < unit[1].length && n > 0; j ) {
p = digit[n % 10] unit[1][j] p;
n = Math.floor(n / 10);
}
s = p.replace(/(zero.)*zero$/, '')
.replace(/^$/, 'zero')
unit[0][i] s;
}
return s.replace(/(zero.)*zero yuan/, 'yuan')
.replace(/(zero.) /g, 'zero')
.replace(/^$/, 'zero yuan') 'whole';
}

alert(digit_uppercase(0)); // Zero yuan
alert(digit_uppercase(123)); // One hundred, twenty, thirty and three yuan
alert(digit_uppercase(1000000)); // One million yuan
alert(digit_uppercase(100000001)); // One hundred and one yuan
alert(digit_uppercase(1000000000)); // One billion yuan
alert(digit_uppercase(1234567890)); // One hundred two hundred million three thousand four hundred five hundred six thousand seven thousand seven thousand eight hundred ninety ten yuan
alert(digit_uppercase(1001100101)); // One billion and one hundred and one hundred and one hundred and one yuan
alert(digit_uppercase(110101010)); // One hundred million one thousand one hundred thousand one thousand one hundred yuan