返回指定索引的字符(Unicode码的位置)。
Returns the character (Unicode code point) at the specified index.
给定一个字符串，找出其中第一个不重复出现的字符，返回其位置索引。
Given a string, find the first non-repeating character in it and return it's index.
给定一个字符串，找出其中第一个不重复出现的字符，返回其位置索引。
Given a string, find the first non-repeating character in it and return it's index.
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