# Functions
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DeleteDirFilesWithPref 删除 dir 目录下所有以 pref 开头的文件.
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DirExist 判定目录是否存在.
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MkdirWhenNo 目录不存在则创建，存在则忽略.
MkdirY 在dir下面，按年创建文件夹.
MkdirYM 在dir下面，按年月创建文件夹.
MkdirYMD 在dir下面，按年月日创建文件夹.
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ReadXls 读取 xls 第一个sheet的内容.
ReadXlsWithSheetIdx 读取 xls 指定 sheet的内容.
ReadXlsWithSheetName 读取 xls 指定 sheet的内容.
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XlsSheetNames xls sheet名字列表.
XlsSheetNum xls sheet数量.
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XlsxAddColAtLast 在最后面插入一列，根据第一行的列数来确定最后一列.
XlsxAddRowsAtLast 在最后面插入一行.
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XlsxSheetAddRowsAtLast 在指定Sheet最后面插入一行.
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