is like this. By default, a page table needs to write the contents of the first three lines, and it cannot be edited. Of course, the button also needs to be hidden
. 
 
 
 before referring to the big shots of the code Baidu, using a ternary expression to hide only a 
 may be because js is not too familiar with it, very embarrassing. I can"t think of an idea for a long time. 
 you need to hide or replace the buttons after id 1, 2, 3 with the string"-". ) 
 Please tell me how to write thank you guys. 
 then ask to learn some JS resource books or video tutorials, I feel that js is the key point or js is too lame. 

