excel 转换成VBA 代码 ：在入库或者出库一栏输入数据自动计算库存，请问如何用VBA代码来实现？

试试以下代码

Sub Worksheet_Change(ByVal Target As Range)
If Target.Row > 1 And Target.Column > 4 And Target.Column < 7 Then
i = Target.Row
Cells(i, 7) = Cells(i - 1, 7) + Cells(i, 5) - Cells(i, 6)
End If
End Sub

Private Sub Workbook_Open()

Dim k As Long

k = Range("g" & i).Value

End Sub

Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)

Dim i, j, k As Integer

i = Target.Row

j = Target.Column

If i < 3 And i > 50 Then Exit Sub

If j <> 5 And j <> 6 Then Exit Sub

Range("g" & i).Value = k + Range("e" & i).Value - Range("f" & i).Value

End Sub