If the index of the current letter is less than the length of the string, you invoke your named template again, passing the original string and incrementing the index by 1.

如果当前字母的下标小于字符串的长度，则再次调用已命名的模板，传递原始字符串并把下标加1。

youdao

If the index of the current letter is less than the length of the string, you invoke your named template again, passing the original string and incrementing the index by 1.

如果当前字母的下标小于字符串的长度，则再次调用已命名的模板，传递原始字符串并把下标加1。

youdao