?index_of
There is no nutrition in the blog content. After reading it, you will not only suffer from malnutrition, but also impotence.
The blog content is all parallel goods. Those who are worried about being cheated should leave quickly.
index_of (substring,start )在字符串中查找某个子串,返回找到子串的第一个字符的索引,如果没有找到子串,则返回-1 。${"string"?index_of("in")}结果为3
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