js小写数字转大写

digitUppercase:function(n) {
                var fraction = ['角', '分'];
                var digit = [
                        '零', '壹', '贰', '叁', '肆',
                        '伍', '陆', '柒', '捌', '玖'
                ];
                var unit = [
                        ['元', '万', '亿'],
                        ['', '拾', '佰', '仟']
                ];
                var head = n < 0 ? '欠' : '';
                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(/零./, '');
                }
                s = s || '整';
                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(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
                }
                return head + s.replace(/(零.)*零元/, '元')
                        .replace(/(零.)+/g, '零')
                        .replace(/^整$/, '零元整');
        }