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你仔细看一下帮助文档:
trim 有两种语法:
Syntax
Trim (string)
Trim (string,character [ ,option] )
说明:
Remarks
In the first syntax, multiple occurrences of spaces and tabs are reduced to single ones, and all leading and trailing spaces and tabs are removed.
在第一种语法中,多个存在的空格和tab被转换成一个,所有开头和结尾的空格和tab 符号都被去掉。
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