tnbapp/src/permission.js

import router from './router'
import { getAccessToken } from '@/utils/auth'

router.beforeEach((to, from, next) => {
  const needAuth = to.meta.needAuth
  const token = getAccessToken()
  if (to.path === '/login' && token !== null) {
    next({ path: '/' })
  } else {
    next()
  }

  if (needAuth && token === null) {
    next('/login')
  } else {
    next()
  }

  if (!needAuth) {
    next()
  } else {
    if (token === null) {
      next('/login')
    }
  }
})