基本操作 StrAssign(&T, chars) Destroy String(&s) StrCopy(&t, s) Strengh sth(s) StrCompare (S, T) Concat(&T, S1, S2) StrEmpty(S基本操作： StrAssign (&T, chars) StrCopy (&T, S) DestroyString(&S) StrEmpty (S) StrCompare (S, T) StrLength(S) Concat (&T, S1, S2)