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()
})
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