js:数字转大写

numFormatter (temp){
    let changeNum = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九'];
      let unit = ["", "十", "百", "千", "万"];
      let strArr = temp.toString().split("").reverse();
      let newNum = "";
      if(temp < 100){
        for (var i = 0; i < strArr.length; i++) {
          newNum = (
            // temp为0时,newNum为空
            i == 0 && strArr[i] == 0 && strArr.length<3 ? "" : 
            (
              // temp为0时,newNum为空
              i > 0 && strArr[i] == 0 && strArr[i - 1] == 0 ? "" : 
              (
                  // 10~19以内 不是10
                strArr[i] == 1 && strArr[i - 1] <= 9&& strArr[i - 1] != 0 ? 
                unit[i] +changeNum[strArr[i - 1]]:
                // 10~19以内 是10
                (strArr[i] == 1 && strArr[i - 1] <= 9&& strArr[i - 1] == 0 && strArr.length<3 ? unit[i]
                // 10~19以外的数字
                :changeNum[strArr[i]] + 
                  (
                    strArr[i] == 0 ? unit[0] :unit[i]
                  )
                )
              )
            )
          ) + (strArr[i] == 1 && strArr[i - 1] <= 9 ? '' : newNum);
        }
        return newNum;
      }else{
        for (var i = 0; i < strArr.length; i++) {
          newNum = (i == 0 && strArr[i] == 0 ? "" : (i > 0 && strArr[i] == 0 && strArr[i - 1] == 0 ? "" : changeNum[strArr[i]] + (strArr[i] == 0 ? unit[0] : unit[i]))) + newNum;
        }
        return newNum;
      }
    },

借鉴:https://blog.csdn.net/gaomeng965/article/details/79174694