通常 IFS 变量应该有一个空格、一个制表符和一个新行的值 -- 这些字符都会被作为一个空格字符来处理。
Normally the IFS variable would have the value of a space, a tab, and a newline -- any of those characters would be treated like a space character.
第二个方法使用了一个空格作为“默认”分隔符。
The second one USES a single space as the "default" separator.
如果打印一个map，您可以看到map项之间的逗号，但这些逗号纯粹是为了可读性而添加的；在Clojure中，逗号将被作为空格处理。
If you print a map you'll see commas between map entries, but it's purely for readability; commas are treated as whitespace in Clojure.
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