What is the principle of the web on-screen comment system?

problem description

 web

the environmental background of the problems and what methods you have tried

related codes

/ / Please paste the code text below (do not replace the code with pictures)

what result do you expect? What is the error message actually seen?

May.15,2022

var myVid=document.getElementById("video1");
myVid.addEventListener("timeupdate",timeupdate);

function timeupdate(){
    var time = myVid.currentTime;
}
//


MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e3c86f-446ce.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3c86f-446ce.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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