vba 如果字符变量a 为“所有类型”，则a与b变量相同，否则a为A2单元格的值

Sub CompareVariables() Dim a As String Dim b As String a = "所有类型" If a = "所有类型" Then b = a MsgBox "a与b变量相同" Else a = Range("A2").Value MsgBox "a的值为：" & a End If End Sub