对于 <c:forTokens> 而言，通过 items 属性指定要标记化的字符串，而通过 delims 属性提供用于生成标记的一组定界符。
For <c:forTokens>, the string to be tokenized is specified through the items attribute, while the set of delimiters used to generate the tokens is provided through the delims attribute.
定界符：一个字符或者字符串，用来确定字符分割时候的分界。
A character or string used to indicate where a string should be split.
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