Most Undo facilities are constructed in an unrelentingly function-centric manner. They remember what a user does function by function and separate her actions by individual function.

• 大多数撤销功能以一种不友好的功能为中心的方式构建，它们一个功能一个功能地记住用户的动作，并且以单个功能为基础区分用户操作。