mousemove事件例子疑问求助

wwd1234wwd

当鼠标移动到控件上时，控件自动移开，我相问下，在选择随机值时候为什么要这么设置？

1. Private Sub cmd_MouseMove(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)
   
2. Dim l As Integer, t As Integer
   
3. l = Int(Rnd() * 10 + 125) * (Int(Rnd() * 3 + 1) - 2)
   
4. t = Int(Rnd() * 10 + 30) * (Int(Rnd() * 3 + 1) - 2)
   
5. cmd.Top = cmd.Top + t
   
6. cmd.Left = cmd.Left + l
   
7. End Sub

复制代码

哪位高手帮我解答下中间随机的这两行代码