请问以下代码中Dim是什么意思呢？期待各位大虾的回答

Question

 Dim dt As New DataTable
        dt = Menus.getMenu(Session("UserID"))
        Dim dv As New DataView(dt, "ParentID = 0", "MenuID",    DataViewRowState.CurrentRows)
        Dim dvi As New DataView(dt)
        Dim i, j As Integer

Answer 1

变量声明前置符