function digit_uppercase(n) {
var digit = [
'零', '壹', '貳', '叁', '肆',
'伍', '陸', '柒', '捌', '玖'
];
var unit = [
['元', '萬', '億'],
['', '拾', '佰', '仟']
];

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(/(零.)*零$/, '')
.replace(/^$/, '零')
+ unit[0][i] + s;
}
return s.replace(/(零.)*零元/, '元')
.replace(/(零.)+/g, '零')
.replace(/^$/, '零元') + '整';
}

alert(digit_uppercase(0)); // 零元整
alert(digit_uppercase(123)); // 壹佰貳拾叁元整
alert(digit_uppercase(1000000)); // 壹佰萬元整
alert(digit_uppercase(100000001)); // 壹億零壹元整
alert(digit_uppercase(1000000000)); // 壹拾億元整
alert(digit_uppercase(1234567890)); // 壹拾貳億叁仟肆佰伍拾陸萬柒仟捌佰玖拾元整
alert(digit_uppercase(1001100101)); // 壹拾億零壹佰壹拾萬零壹佰零壹元整
alert(digit_uppercase(110101010)); // 壹億壹仟零壹拾萬壹仟零壹拾元整