上下文是作为菜单命令目标的对象。
Usually the context is the current selection or the item under the mouse when invoking a context menu.
// Add context menu named "Do Something" to context menu @MenuItem ("CONTEXT/Rigidbody/Do Something") static function DoSomething (command : MenuCommand) { var body : Rigidbody = command.context; body.mass = 5; }