将人民币金额转换为大写的JavaScript代码

/** 数字金额大写转换(可以处理整数,小数,负数) */    function upDigit(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');    }