has fewer digits than the number of zeros in the format code, (on either side of the decimal), leading or trailing zeros are displayed. If the number has more digits to the left of the decimal separator than the number of zeros in the format code, the additional digits are displayed without formatting.
表达式中小数点任意一侧的位数小于格式代码中零的个数，将显示前置零或后置零。如果 Number 中小数分隔符左侧的位数多于格式代码中零的个数，则不加修改地显示多余的位。