js千分位带小数显示处理

// 参照Elmenent ui statistic组件
 function dispose(value = '', precision = null, groupSeparator = '', rate = 1000 ) {

      if (!isNumber(value)) return false;

      let [integer, decimal] = String(value).split('.');

      if (precision) {

        decimal = `${decimal || ''}${(1)

          .toFixed(precision)

          .replace('.', '')

          .slice(1)}`;

        decimal = decimal.slice(0, precision);

      }

      let result = 0;

      if (groupSeparator) {

        integer = this.magnification(integer, rate, groupSeparator);

      }

      result = [integer, decimal].join(

        decimal ? this.decimalSeparator : ''

      );

      this.disposeValue = result;

      return result;

    }

   function magnification(num, mulriple = 1000, groupSeparator = ',') {

      // magnification factor

      const level = String(mulriple).length - 1;

      const reg = new RegExp(`\\d{1,${level}}(?=(\\d{${level}})+$)`, 'g');

      const result = String(num)

        .replace(reg, '$&,')

        .split(',')

        .join(groupSeparator);

      return result;

    }