JS金額轉大寫

//金額轉大寫
    function numToCny(n) {
        if (!/^(0|[1-9]\d*)(\.\d+)?$/.test(n)) return "數據非法";
        var unit = "京億萬仟佰拾兆萬仟佰拾億仟佰拾萬仟佰拾元角分", str = "";
        n += "00";
        var p = n.indexOf('.');
        if (p >= 0)
            n = n.substring(0, p) + n.substr(p + 1, 2);
        unit = unit.substr(unit.length - n.length);
        for (var i = 0; i < n.length; i++) str += '零壹貳叄肆伍陸柒捌玖'.charAt(n.charAt(i)) + unit.charAt(i);
        return str.replace(/零(仟|佰|拾|角)/g, "零").replace(/(零)+/g, "零").replace(/零(兆|萬|億|元)/g, "$1").replace(/(兆|億)萬/g, "$1").replace(/(京|兆)億/g, "$1").replace(/(京)兆/g, "$1").replace(/(京|兆|億|仟|佰|拾)(萬?)(.)仟/g, "$1$2零$3仟").replace(/^元零?|零分/g, "").replace(/(元|角)$/g, "$1整");
    }