Thanks for answering,wanna try the second solution.
But I’m using Nginx,so I added the code below to my .conf:
location ~* \.(?:html)$ {
expires 0d;
add_header Pragma public;
add_header Cache-Control "public";
try_files $uri =404;
}
But still the browser needs refreshing manually to see the new one when a comment is submited by a previously approved author.