操作是可以对页面执行的操作（编辑、删除、回滚等） It is distinct from special pages in that an action must apply to exactly one page. To add an action to an extension, create a subclass of Action, and add the key to $wgActions.

Actions generally fall into two groups:

• a group represented by the FormAction class, intended for showing a form and acting on the input (protect, delete, move, etc.),
• a group represented by the FormlessAction class, intended for actions that do not require a form (watch, rollback, patrol, etc.).

参见

• 手册:$wgActions