Using this same knowledge, we could create different categories of incremental Undo, like a format-Undo function that would Undo only preceding format commands and other types of category-specific Undo actions.

• 借助同样的知识，我们能够创建不同类别的渐增撤销。 诸如格式撤销功能，它仅仅撤销之前的格式命令，我们还可以创建其他类别的撤销操作。