自定义数字格式字符串

参考资料：自定义数字格式字符串。

部分格式会受到国家地区影响，默认使用本机设置。

注：某些国家地区,为小数点，.为分隔符。

格式说明符	名称	说明	示例
0	零占位符	至少有几个0，不足则补0	(12.34, "0.0") = 12.3 (12.34, "0.0000") = 12.3400 (12.34, "0000.0") = 0012.3
#	数字占位符	最多有N个0，不足则补0	(12.34, "#.#") = 12.3 (12.34, "#.####") = 12.34 (12.34, "####.#") = 12.3
.	小数点	.可以认为表示数字本身 多个小数点仅第一个有效	(12345, "7.0") = 712345.0 (12345, "7.") = 712345 (12345, "7.8") = 7123458 (12.34, "0.000.00") = 12.34000
,	组分隔 数字缩放	在0或#之间使用 （连续,视为一个,）视为分隔符，多组视为一组 ,在最后是除以1000 ,在开头无效	(1234567.1234, "0,0,0.0") = 1,234,567.1 (1234567.1234, "0,0.0") = 1,234,567.1 (1234567.1234, "0,,,0.0") = 1,234,567.1 (1234567.1234, "0,.000") = 1234.567 (1234567.1234, ",0.000") = 1234567.123 (1234567.1234, "P,0.000") = P1234567.123
%	百分号占位符	将数字乘以100并添加占位符%	(-1.23456, "0.00%") = -123.46% (-1.23456, "0.%00%") = -12345.%60% (-1.23456, "0.00%%") = -12345.60%%
‰	千分号占位符	将数字乘以1000并添加占位符‰	(-1.23456, "0.00‰") = -1234.56‰ (-1.23456, "0‰.00‰")
e、E、e0、e+0、e-0	指数表示法	指数法 指数部分使用#无效，仅作为占位符 +强制显示+ -可不写	(-1.23456, "e") = -1.234560e+000 (-123456, "e3") = -1.235e+005 (-123456, "00e-00") = -12e04 (123456, "00.##e+0") = 12.35e+4 (123456, "00.##e0") = 12.35e4
\\	转义符	保留字符原文	(123.456, "0.0.0") = 123.46 (123.456, "0.0\.0") = 123.4.6 (123.456, "0.0\.\0") = 123.5.0
' "	字符分隔	保留字符原文 单个引号表示从符号位置到结束都是原文 双引号需要转义	(123.456, "0.0'.0'0") = 123.4.06 (123.456, "0.0'.00") = 123.5.00 (123.456, "0.0"".00") = 123.5.00
;	节分隔符
其它		原封不动复制到结果