数字金额大写转换

/** 数字金额大写转换(可以处理整数,小数,负数) */
       var digitUppercase = function(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;
           }
           var value=head + s.replace(/(零.)*零元/, '元').replace(/(零.)+/g, '零').replace(/^整$/, '零元整');

           return value;

       };