updated 06/22/2018

Problem solved as it seem to  because of  i didn’t check the box in attachment  display setting”link to media file”, the last post was also fixed.

—

It figured out that the Lightbox plugin was not working when i posted the article yesterday.

Today i made a change  for  a more recently  updated plugin called Simple Lightbox ,no difference at all .Then i deactivated all plugin and replaced the theme for the official one .Nothing happened.

The latest time when i remember it working was months before ,after i posted the article in Shanghai.After then i almost made no change,except for normal plugin & wordpress update.It’s hard to fix it for me as i merely know nothing about php language…