JS實現數字轉換為貨幣漢字大寫數字

<script>        function Chinese(num) {            if (!/^\d*(\.\d*)?$/.test(num)) throw (new Error(-1, "Number is wrong!"));            var AA = new Array("零", "壹", "貳", "三", "肆", "伍", "陸", "柒", "捌", "玖");            var BB = new Array("", "拾", "佰", "仟", "萬", "億", "圓", "");            var CC = new Array("角", "分", "厘");            var a = ("" + num).replace(/(^0*)/g, "").split("."), k = 0, re = "";            for (var i = a[0].length - 1; i >= 0; i--) {                switch (k) {                    case 0: re = BB[7] + re; break;                    case 4: if (!new RegExp("0{4}\\d{" + (a[0].length - i - 1) + "}$").test(a[0]))                            re = BB[4] + re; break;                    case 8: re = BB[5] + re; BB[7] = BB[5]; k = 0; break;                }                if (k % 4 == 2 && a[0].charAt(i) == "0" && a[0].charAt(i + 2) != "0") re = AA[0] + re;                if (a[0].charAt(i) != 0) re = AA[a[0].charAt(i)] + BB[k % 4] + re; k++;            }            if (a.length > 1) {                re += BB[6];                for (var i = 0; i < a[1].length; i++) {                    re += AA[a[1].charAt(i)] + CC[i];                    if (i == 2) break;                }                if (a[1].charAt(0) == "0" && a[1].charAt(1) == "0") {                    re += "元整";                }            } else {                re += "元整";            }            return re;        }        document.write(Chinese(1)); //壹元整    </script>