谁能帮我分析一下这个
Private Sub Form_Load()
End Sub
Private Sub Text1_Change()
Dim str As String
str = Right(Text1.Text, 1)
If (str >= "a" And str <= "z") Then
str = UCase(str)
ElseIf (str >= "A" And str <= "Z") Then
str = LCase(str)
Else
str = str
End If
Text2.Text = Text2.Text + str
Text2.Text = StrReverse(Text1.Text)
End Sub