14. The method of claim 12 , wherein, when the characters in the first character string are not all traversed, and a character string which is not traversed does not include the separators, the fourth preset rule further includes: acquiring the character string which is not traversed in the first character string, and using the character string which is not traversed in the first character string as the first character string.
15. The method of claim 14 , further comprising: appending the returned result to the first preset variable, and returning the first preset variable when the first character string satisfies the second preset rule.