小写数字转化大写汉字

效果：

代码：

capitalAmount(amount) {
      // 汉字的数字
      const cnNums = [
        "零",
        "壹",
        "贰",
        "叁",
        "肆",
        "伍",
        "陆",
        "柒",
        "捌",
        "玖",
      ];
      // 基本单位
      const cnIntRadice = ["", "拾", "佰", "仟"];
      // 对应整数部分扩展单位
      const cnIntUnits = ["", "万", "亿", "兆"];
      // 对应小数部分单位
      const cnDecUnits = ["角", "分", "毫", "厘"];
      // 整数金额时后面跟的字符
      const cnInteger = "整";
      // 整型完以后的单位
      const cnIntLast = "元";
      // 最大处理的数字
      const maxNum = 9999999999999999.99;
      // 金额整数部分
      let integerNum;
      // 金额小数部分
      let decimalNum;
      // 输出的中文金额字符串
      let chineseStr = "";
      // 分离金额后用的数组，预定义
      let parts;
      if (amount === "") {
        return "";
      }
      amount = parseFloat(amount);
      if (amount >= maxNum) {
        // 超出最大处理数字
        return "";
      }
      if (amount == 0) {
        chineseStr = cnNums[0] + cnIntLast + cnInteger;
        return chineseStr;
      }
      // 转换为字符串
      amount = amount.toString();
      if (amount.indexOf(".") == -1) {
        integerNum = amount;
        decimalNum = "";
      } else {
        parts = amount.split(".");
        integerNum = parts[0];
        decimalNum = parts[1].substr(0, 4);
        console.log(integerNum);
        console.log(decimalNum);
      }
      // 获取整型部分转换
      console.log(parseInt(integerNum, 10));
      if (parseInt(integerNum, 10) > 0) {
        let zeroCount = 0;
        const IntLen = integerNum.length;
        for (let i = 0; i < IntLen; i++) {
          const n = integerNum.substr(i, 1);
          const p = IntLen - i - 1;
          const q = p / 4;
          const m = p % 4;
          if (n == "0") {
            zeroCount++;
          } else {
            if (zeroCount > 0) {
              chineseStr += cnNums[0];
            }
            // 归零
            zeroCount = 0;
            if (n > 1) {
              chineseStr += cnNums[n] + cnIntRadice[m];
            } else {
              chineseStr += cnNums[parseInt(n, 2)] + cnIntRadice[m];
            }
          }
          if (m == 0 && zeroCount < 4) {
            chineseStr += cnIntUnits[q];
          }
        }
        chineseStr += cnIntLast;
        console.log(chineseStr);
      }
      // 小数部分
      if (decimalNum !== "") {
        const decLen = decimalNum.length;
        for (let i = 0; i < decLen; i++) {
          const n = decimalNum.substr(i, 1);
          if (n !== "0") {
            chineseStr += cnNums[Number(n)] + cnDecUnits[i];
          }
        }
      }
      if (chineseStr == "") {
        chineseStr += cnNums[0] + cnIntLast + cnInteger;
      } else if (decimalNum == "") {
        chineseStr += cnInteger;
      }
      return chineseStr;
    }