大文字と小文字に変換

//       
function intToChinese(n) {
    var fraction = [' ', ' '];
    var digit = [
        ' ', ' ', ' ', ' ', ' ',
        ' ', ' ', ' ', ' ', ' '
    ];
    var unit = [
        [' ', ' ', ' '],
        ['', ' ', ' ', ' ']
    ];
    var head = n < 0 ? ' ' : '';
    n = Math.abs(n);
    var s = '';
    for (var i = 0; i < fraction.length; i++) {
        s += (digit[Math.floor(n * 10 * Math.pow(10, i))%10]+fraction[i]).
replace(/ ./, '');
    }
    s = s || ' ';
    n = Math.floor(n);
    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(/( .)* $/, '').replace(/^$/, ' ') + unit[0][i] + s;
    }
    return head + s.replace(/( .)*  /, ' ')
                    .replace(/( .)+/g, ' ')
                    .replace(/^ $/, '   ');
}