如果只将其创建为字符串类型，且输入多个值，XPath解析不返回任何用户。
If it is created only as a string and multiple values are entered, the XPath resolution does not return any users.
D {format}：括弧里的字符串被传递给strftime(3)函数，返回值填充到提示符中。如果不传参数，会按照系统默认的当地时间格式来显示。
D {format} : the format is passed to strftime (3) and the result is inserted into the prompt string; an empty format results in a locale-specific time representation.
如果不匹配，那么就会返回字符串None found 。
If no match is found, then the string None found! Is returned.
isPrintable，在给定字符串不包含不可打印字符时返回TRUE，而在给定字符串确实包含不可打印字符时返回FALSE。
IsPrintable , which returns TRUE if the given string contains no unprintable characters and returns FALSE if the given string does contain printable characters.
当返回一个字符串时，该字符串应该是页面的逻辑名(不是页面的类全名)。另外，页面的名字不区分大小写。
When a string is returned, it is expected to be the logical name of a page (as opposed to the page's fully qualified class name). As elsewhere, the name of the page is case insensitive.
如何使一个VBA自定义函数不返回-不是0，不是空字符串，但没有。
How to make a VBA custom function return nothing - not 0, not a blank string, but nothing.
如何使一个VBA自定义函数不返回-不是0，不是空字符串，但没有。
How to make a VBA custom function return nothing - not 0, not a blank string, but nothing.
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