Private Sub Command1_Click()  '全部添加到打印项目
For i = 0 To List1.ListCount - 1
  List1.ListIndex = i
  List2.AddItem List1.Text
Next i
List1.Clear
End Sub

Private Sub Command2_Click()  '添加一条到打印项目
For i = 0 To List1.ListCount - 1
  If List1.Selected(i) = True Then
     a = a + 1
  End If
Next i
If a = 0 Then
   MsgBox "请在左边的文本框中选择项目", , "信息提示"
   Exit Sub
End If
List2.AddItem List1.Text
List1.RemoveItem List1.ListIndex
End Sub

Private Sub Command3_Click()  '全部添加到基本项目
For i = 0 To List2.ListCount - 1
  List2.ListIndex = i
  List1.AddItem List2.Text
Next i
List2.Clear
End Sub

Private Sub Command4_Click()  '添加一条到基本项目
For i = 0 To List2.ListCount - 1
  If List2.Selected(i) = True Then
      a = a + 1
  End If
Next i
If a = 0 Then
   MsgBox "请在右边的文本框中选择项目", , "信息提示"
   Exit Sub
End If
List1.AddItem List2.Text
List2.RemoveItem List2.ListIndex
End Sub

这句
For i = 0 To List1.ListCount - 1
  List1.ListIndex = i
  List2.AddItem List1.Text
Next i
中, List1.ListIndex = i
  List2.AddItem List1.Text什么意思,如何配合使用的啊

说明白点啊

呵呵  是的  就是不好理解