How to add trees to option in select by element-ui

how element-ui adds a tree to select (see figure)

Webpack vue.js element-ui
Mar.14,2021

check this out, okay? https://github.com/wilsonIs/v.

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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-64f5-1eb2dcd-240d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eb2dcd-240d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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