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'); 
}