[JavaScript知识库]数字金额和汉字金额大写转换方法

前端：

方法一(简单粗暴)：

function digitUppercase(num) {
  var strOutput = "";
  var strUnit = '仟佰拾亿仟佰拾万仟佰拾元角分';
  num += "00";
  var intPos = num.indexOf('.');
  if (intPos >= 0)
    num = num.substring(0, intPos) + num.substr(intPos + 1, 2);
  strUnit = strUnit.substr(strUnit.length - num.length);
  for (var i = 0; i < num.length; i++)
    strOutput += '零壹贰叁肆伍陆柒捌玖'.substr(num.substr(i, 1), 1) + strUnit.substr(i, 1);
  return strOutput.replace(/零角零分$/, '整').replace(/零[仟佰拾]/g, '零').replace(/零{2,}/g, '零').replace(/零([亿|万])/g, '$1').replace(/零+元/, '元').replace(/亿零{0,3}万/, '亿').replace(/^元/, "零元");
};

方法二：

/**
 * exp:
 * console.log(digitUppercase(7682.01)); //柒仟陆佰捌拾贰元壹分
 * console.log(digitUppercase(7682));  //柒仟陆佰捌拾贰元整
 * console.log(digitUppercase(951434677682.00)); //玖仟伍佰壹拾肆亿叁仟肆佰陆拾柒万柒仟陆佰捌拾贰元整
 */

// 向右移位
function shiftRight(number: number, digit: any) {
  digit = parseInt(digit, 10);
  var value = number.toString().split('e');
  return +(value[0] + 'e' + (value[1] ? (+value[1] + digit) : digit))
}
// 向左移位
function shiftLeft(number: number, digit: any) {
  digit = parseInt(digit, 10);
  var value = number.toString().split('e');
  return +(value[0] + 'e' + (value[1] ? (+value[1] - digit) : -digit))
}
// 
export const digitUppercase = (num: number) => {
  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 = num < 0 ? '欠' : '';
  num = Math.abs(num);
  var s = '';
  for (var i = 0; i < fraction.length; i++) {
    s += (digit[Math.floor(shiftRight(num, 1 + i)) % 10] + fraction[i]).replace(/零./, '');
  }
  s = s || '整';
  num = Math.floor(num);
  for (var i = 0; i < unit[0].length && num > 0; i++) {
    var p = '';
    for (var j = 0; j < unit[1].length && num > 0; j++) {
      p = digit[num % 10] + unit[1][j] + p;
      num = Math.floor(shiftLeft(num, 1));
    }
    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');
}

效果：

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后端：

public class Change {
  public static void main(String agrs[]) {
    //整数
    System.out.println(digitUppercase(0));              // 零元整
    System.out.println(digitUppercase(123));            // 壹佰贰拾叁元整
    System.out.println(digitUppercase(1000000));        // 壹佰万元整
    System.out.println(digitUppercase(100000001));      // 壹亿零壹元整
    System.out.println(digitUppercase(1000000000));     // 壹拾亿元整
    System.out.println(digitUppercase(1234567890));     // 壹拾贰亿叁仟肆佰伍拾陆万柒仟捌佰玖拾元整
    System.out.println(digitUppercase(1001100101));     // 壹拾亿零壹佰壹拾万零壹佰零壹元整
    System.out.println(digitUppercase(110101010));      // 壹亿壹仟零壹拾万壹仟零壹拾元整

    //小数
    System.out.println(digitUppercase(0.12));          // 壹角贰分
    System.out.println(digitUppercase(123.34));        // 壹佰贰拾叁元叁角肆分
    System.out.println(digitUppercase(1000000.56));    // 壹佰万元伍角陆分
    System.out.println(digitUppercase(100000001.78));  // 壹亿零壹元柒角捌分
    System.out.println(digitUppercase(1000000000.90)); // 壹拾亿元玖角
    System.out.println(digitUppercase(1234567890.03)); // 壹拾贰亿叁仟肆佰伍拾陆万柒仟捌佰玖拾元叁分
    System.out.println(digitUppercase(1001100101.00)); // 壹拾亿零壹佰壹拾万零壹佰零壹元整
    System.out.println(digitUppercase(110101010.10));  // 壹亿壹仟零壹拾万壹仟零壹拾元壹角

    //负数
    System.out.println(digitUppercase(- 0.12));          // 负壹角贰分
    System.out.println(digitUppercase(- 123.34));        // 负壹佰贰拾叁元叁角肆分
    System.out.println(digitUppercase(- 1000000.56));    // 负壹佰万元伍角陆分
    System.out.println(digitUppercase(- 100000001.78));  // 负壹亿零壹元柒角捌分
    System.out.println(digitUppercase(- 1000000000.90)); // 负壹拾亿元玖角
    System.out.println(digitUppercase(- 1234567890.03)); // 负壹拾贰亿叁仟肆佰伍拾陆万柒仟捌佰玖拾元叁分
    System.out.println(digitUppercase(- 1001100101.00)); // 负壹拾亿零壹佰壹拾万零壹佰零壹元整
    System.out.println(digitUppercase(- 110101010.10));  // 负壹亿壹仟零壹拾万壹仟零壹拾元壹角
  }

  /**
   * 数字金额大写转换，思想先写个完整的然后将如零拾替换成零
   * 要用到正则表达式
   */
  public static String digitUppercase(double n) {
    String fraction[] = { "角" , "分" };
    String digit[] = { "零" , "壹" , "贰" , "叁" , "肆" , "伍" , "陆" , "柒" , "捌" , "玖" };
    String unit[][] = {{ "元", "万", "亿" }, { "", "拾", "佰", "仟" }};

    String head = n < 0 ? "负" : "";
    n = Math.abs(n);
        
    String s = "";
    for(int i = 0 ; i <fraction.length; i++) {
      s += (digit[(int)(Math.floor(n * 10 * Math.pow(10, i)) % 10)] + fraction[i]).replaceAll("(零.)+", "");
    }
    if (s.length() < 1) {
      s = "整";
    }
    int integerPart = (int)Math.floor(n);
    for (int i = 0; i < unit[0].length && integerPart > 0 ; i++) {
              String p = "";
      for (int j = 0; j < unit[1].length && n > 0 ; j++) {
        p = digit[integerPart % 10] + unit[1][j] + p;
        integerPart = integerPart / 10;
      }
      s = p.replaceAll("(零.)*零$", "").replaceAll("^$", "零") + unit[0][i] + s;
    }
    return head + s.replaceAll("(零.)*零元", "元").replaceFirst("(零.)+", "").replaceAll("(零.)+", "零").replaceAll("^整$", "零元整");
  }
}

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