JS数字金额大写转换(可以处理整数,小数,负数)

//数字金额大写转换                                                                                           
  
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');  
}