题解 | #分隔符#

 function _comma(number) {
      const toStr = number < 0 ? (number * -1) + '' : number + '';
      console.log(toStr);
      let array = Array.from(toStr);
      let count = 0;
      for (let i = array.length - 1; i > 0; i--) {
        count++;
        if (count === 3) {
          array[i - 1] += '，';
          count = 0;
        }
      }
      return number > 0 ? array.join('') : '-' + array.join('');
    }

数学差生解法