Why does a table in word in js take up thousands of characters when converted into a string?

chatMsg = filterChatMsg(chatMsg);
            var msgObj ={
                    msg:chatMsg,
                    userId:"ac_"+AgentObj.agentId
                }
            var centertab = Ext.getCmp("center_id");
            if(currentWin.indexOf("c_")!==0){
                alert("");
                return  false;
            }
            if(chatMsg==""||chatMsg==null){
                alert("");
                return false;
            }
            if(chatMsg.length>500){
                alert(chatMsg.length);//
                alert("500");
                return false;
            }
Apr.09,2021

Space s is occupied

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-64f5-1ea3383-1c3f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea3383-1c3f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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