Vue-router router-view rendering issu

use vue-router to do a simple route, mainly to change the list of secondary menus on the right by clicking on the left menu, and render the middle theme content when you click the secondary menu. Both router-view in the
code are rendered as secondary menu lists. I still don"t know how to solve the problem when I"m a beginner in vue,. For the
code, please click the link below
https://jsfiddle.net/sgkto482/

.
Mar.31,2021

ide/essentials/named-views.html" rel=" nofollow noreferrer "> https://router.vuejs.org/zh/g.

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-64f5-1e51b4e-45151.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e51b4e-45151.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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