If else is too easy to use? (understanding this article will further improve your logic)

1. This article is related to if else Your article is a great test of your logical thinking ability , There are many things involved .

2. The first is such a rendering , The steps we want to implement include the following steps ：

（1） Whether to trigger verification when changing to yes , If no, cancel the verification

                    

（2） Cancel verification after uploading attachments , Generate verification after deleting attachments .

                  

 （3）. Select Yes after deleting attachments 、 no , You also need to implement the relevant logic of the first step .

（4）. Save occurrence verification

                                                The code is here

（1）.html part

（2）. Verify that the display is hidden

 （3）. Parts involving attachments

 （4）. Save tips