数字转中文

• 传入万亿以下的整数转中文

  /**
   * 数字转中文
   * @param {number} number 万亿以下的数字
   */
  function transformToChineseNumber(number) {
    // number 每四位四位分割
    const num = number.toString().replace(/(?=(\d{4})+$)/g, ",");
    // num 按,分割
    const arr = num.split(",").filter(Boolean);
    //   console.log(arr);
  
    const _number_map = {
      0: "零",
      1: "一",
      2: "二",
      3: "三",
      4: "四",
      5: "五",
      6: "六",
      7: "七",
      8: "八",
      9: "九",
    };
  
    const _unit_map = ["", "十", "百", "千"];
  
    const _big_unit_map = ["", "万", "亿"];
  
    /**
     * 处理传入的字符串中的数字
     * @param {string} _number_string 待处理字符串数字
     */
    function _handleZero(_number_string) {
      return _number_string.replace(/零+/g, "零").replace(/零$/, "");
    }
  
    /**
     * 转换四位数字
     *
     */
    function _transformNumber4(_num) {
      let _res = "";
      for (let i = 0; i < _num.length; i++) {
        const _res_num = _number_map[_num[i]];
        let _res_unit = _unit_map[_num.length - 1 - i];
        if (_res_num == "零") {
          _res_unit = "";
        }
        _res += _res_num + _res_unit;
      }
      _res = _handleZero(_res);
      return _res;
    }
    let res = "";
    for (let i = 0; i < arr.length; i++) {
      const c = _transformNumber4(arr[i]);
      const _big_unit = _big_unit_map[arr.length - i - 1];
      // console.debug("c = ", c, "  _big_unit = ", _big_unit);
      res += c + _big_unit;
    }
    return res;
  }