vb listbox题创建一个应用程序，界面如图所示，要求：设计窗体含两个列表框List1和List2，其中列表框1代表
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Private Sub Command1_Click()

If List1.ListIndex > -1 Then

List2.AddItem List1.List(List1.ListIndex)

Command3.Enabled = True

End If

End Sub

Private Sub Command2_Click()

If List2.ListIndex > -1 Then

List2.RemoveItem List2.ListIndex

End If

End Sub

Private Sub Command3_Click()

Dim s As String, i As Integer

Command1.Enabled = False

Command2.Enabled = False

For i = 1 To List2.ListCount

s = s " " List2.List(i - 1)

Next

MsgBox "购买了" s

End Sub

Private Sub Command4_Click()

Unload Me

End Sub

Private Sub Form_Load()

List1.AddItem "苹果"

List1.AddItem "橘子"

List1.AddItem "香蕉"

List1.AddItem "梨"

Command1.Caption = "购买"

Command2.Caption = "退货"

Command3.Caption = "统计"

Command3.Enabled = False

Command4.Caption = "退出"

End Su

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