php和js取两位小数

   $value = StringHelper::round($value, 2);

/**
     * @param $val
     * @param int $precision
     * @param int $mode
     * @return string
     */
    public static function round($val, $precision = 0, $mode = PHP_ROUND_HALF_UP): string
    {
        $val = round($val, $precision, $mode);

        if ($precision > 0) {
            $pos = strpos($val, '.');

            if ($pos === false) {
                $val .= '.' . str_repeat('0', $precision);
            } else {
                $zeroNum = $precision - (strlen($val) - $pos - 1);
                if ($zeroNum > 0) {
                    $val .= str_repeat('0', $zeroNum);
                }
            }
        }

        if (strpos($val, '.') === false && $precision > 0) {
            $val .= '.' . str_repeat('0', $precision);
        }

        return $val;
    }

// {{ productionN(dmsItem.calculateValue, 2) + '%' }}

   
productionN (v, n) {
      const len = v.length
      let pos = v.indexOf('.')
      if (pos < 0) {
        if (v == 0 || v == 1) {
          return v == 0 ? 0 : 100
        } else {
          return parseInt(v)
        }
      }
      pos += n
      if (pos >= len) {
        v = parseInt(v.replace('.', ''))
        for (let i = 0; i < pos - len + 1; i++) {
          v += '0'
        }
        return v
      }
      const partOne = v.substr(0, pos + 1).replace('.', '')
      const partTwo = v.substr(pos + 1).replace(/0+$/, '')
      if (partTwo === '') {
        return parseInt(partOne)
      }
      return parseInt(partOne) + '.' + partTwo
    },