If the format code contains only # placeholders to the left of this symbol, numbers less than 1 begin with a decimal separator. To always display a leading zero with fractional numbers, use 0 as a placeholder for the first digit to the left of the decimal separator.
如果格式代码中此符号左边仅含有 # 占位符，则纯小数将以小数分隔符作为起始字符。要使小数始终显示有前置零，请用 0 作为小数分隔符左边第一位的占位符。