在窗体中添加一个命令按钮,名称为Command1,然后编写如下程序: Private Sub Command1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single) Print "ABC" End Sub Private Sub Command1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single) If Button = 2 Then Print "CBA" End If End Sub 程序运行后,在命令按钮上鼠标右键,则在窗体上显示的内容是_____。