注意 correct 等于 on 或 off, 不是 true 与 false

 $form->switch ("correct", "纠正？")->states ($this->getStatusList ())->default (true);
        $form->editormd ('content', '内容');
        $form->saving (function (Form $form) {$service = new CopyWritingCorrectService ();
            $form->title = $service->correct ($form->title);
            if ($form->correct == "on") {$form->content = $service->correct ($form->content);
            }

        });