Router-view multi-layer nested routing has no effect

Novice vue.js, wants to use vue.js to build a background management framework, in which Vue Router, is used to use nested routing, but the content of router-view is not shown. The following is the structure of my component

main.jsrouter

Tab.vue

I wonder which boss can give me some advice.

Mar.28,2021

Anybody help me?


clipboard.png
here you need to keep your routing chain going down

router.beforeEach((to, from, next) => {
    next()
})
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-64f5-1b3b62e-2b5f1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b62e-2b5f1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?