运行效果：
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程序代码：
Private Sub Form_Load()
For i = 0 To Label1.Count - 1
Label1(i).Caption = "移动鼠标"
Next i
End Sub
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Private Sub Label1_MouseMove(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim mouseover As Boolean
mouseover = (0 <= X) And (X <= Label1(Index).Width)
If mouseover Then
For i = 0 To Label1.Count - 1
Label1(i).ForeColor = &H0&
Next i
Label1(Index).ForeColor = &HFF&
End If
End Sub
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学习总结：
1、Count 返回 Long（长整数），包含集合中的对象数目。
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