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要用VBA代码判断Caps Lock键、Num Lock键及Scroll Lock键的开启状态，可以用下面的代码，前四行代码为API声明，需放置在代码窗口的最上方：

Private Declare Function GetKeyState Lib "user32" (ByVal nVirtKey As Long) As Integer
Const VK_NUMLOCK = &H90
Const VK_SCROLL = &H91
Const VK_CAPITAL = &H14
Private Sub KeyStates()
If GetKeyState(VK_CAPITAL) Then 'Caps Lock键
MsgBox "Caps Lock ON"
Else
MsgBox "Caps Lock OFF"
End If

If GetKeyState(VK_NUMLOCK) Then 'Num Lock键
MsgBox "Num Lock ON"
Else
MsgBox "Num Lock OFF"
End If
If GetKeyState(VK_SCROLL) Then 'Scroll Lock键
MsgBox "Scroll Lock ON"
Else
MsgBox "Scroll Lock OFF"
End If
End Sub

另外，在Word中可以使用下面的VBA代码来判断Caps Lock键是否开启：

Sub KeyStates()
If Selection.Information(wdCapsLock) Then
MsgBox "Caps Lock 键已开启"
Else
MsgBox "Caps Lock 键已关闭"
End If
End Sub