JS金额转大写

//金额转大写
    function numToCny(n) {
        if (!/^(0|[1-9]\d*)(\.\d+)?$/.test(n)) return "数据非法";
        var unit = "京亿万仟佰拾兆万仟佰拾亿仟佰拾万仟佰拾元角分", 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 += '零壹贰叁肆伍陆柒捌玖'.charAt(n.charAt(i)) + unit.charAt(i);
        return str.replace(/零(仟|佰|拾|角)/g, "零").replace(/(零)+/g, "零").replace(/零(兆|万|亿|元)/g, "$1").replace(/(兆|亿)万/g, "$1").replace(/(京|兆)亿/g, "$1").replace(/(京)兆/g, "$1").replace(/(京|兆|亿|仟|佰|拾)(万?)(.)仟/g, "$1$2零$3仟").replace(/^元零?|零分/g, "").replace(/(元|角)$/g, "$1整");
    }