[求助]这个还书怎么改
Private Function pd(n As String) As LongDim t_len As Integer
t_len = Len(Trim(n))
For i = 1 To t_len
t_mid = Mid(CStr(Trim(n)), i, 1)
If Asc(t_mid) < 48 And Asc(t_mid) > 57 Then
MsgBox ("您输入的电话号码有误,请重新树输入!") ' + vbCritical)
Exit For
End If
Next
End Function