How to display progression by using element-ui tree Control in vue

how does vue display levels using element-ui tree controls
using tree controls I want up to three levels of display

Feb.27,2021
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-64f5-1ea9cfd-1f84.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea9cfd-1f84.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?