How to prevent repeated data insertion from refreshing webpages

There are many simple methods to prevent repeated data insertion from refreshing webpages. let's provide several reference solutions. How to prevent data from refreshing webpages: I made a message

There are many simple methods to prevent repeated data insertion from refreshing webpages. let's provide several reference solutions.

How to prevent data insertion from refreshing webpages:

I made a message board, but information will be inserted every time I refresh it. what can I do to prevent refreshing and inserting data?

JS returns after each operation

1. $ Regs = mysql_query ($ shouruinsert, $ conn );
2. If ($ regs) echo "script window. alert (" Operation successful "success"; script ";
3. }
4. Else {
5. Echo "script window. alert (" Operation failed "); script please check whether the data you submitted is standard or contact the administrator !! ";}
6. You can generate a cookie on the published page. on the submitted page, if the cookie is successfully submitted, the cookie is cleared. you can determine whether the cookie exists during the refreshing process.
7. Another way is to directly judge the database after querying it,
8. If ($ regs ){
9. Die ('is exisit ');
10. } Else {
11. Mysql _.....
12. }