js阿拉伯数字转中文数字

//阿拉伯数字转中文数字
function NoToChinese(num) {
    if (!/^d*(.d*)?$/.test(num)) {
        alert("Number is wrong!");
        return "Number is wrong!";
    }
    var AA = new Array("零", "一", "二", "三", "四", "五", "六", "七", "八", "九");
    var BB = new Array("", "十", "百", "千", "万", "亿", "点", "");
    var a = ("" + num).replace(/(^0*)/g, "").split("."),
        k = 0,
        re = "";
    for (var i = a[0].length - 1; i >= 0; i--) {
        switch (k) {
            case 0:
                re = BB[7] + re;
                break;
            case 4:
                if (!new RegExp("0{4}\d{" + (a[0].length - i - 1) + "}$").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 + 2) != 0 && a[0].charAt(i + 1) == 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) //加上小数部分(如果有小数部分) 
    {
        re += BB[6];
        for (var i = 0; i < a[1].length; i++) re += AA[a[1].charAt(i)];
    }
    return re;
};