Vue implements dynamic routing details

import Vue from 'vue'
import Router from 'vue-router'

Vue.use(Router)

import Layout from '@/layout'

// constantRoutes static routing, mainly login page, 404 page, etc. do not require dynamic routing export const constantRoutes = [
  {
    path: '/redirect',
    component: Layout,
    hidden: true,
    children: [
      {
        path: '/redirect/:path*',
        component: () => import('@/views/redirect/index')
      }
    ]
  },
  {
    path: '/login',
    component: () => import('@/views/login/index'),
    hidden: true
  },
  {
    path: '/404',
    component: () => import('@/views/error-page/404'),
    hidden: true
  },
  {
    path: '/401',
    component: () => import('@/views/error-page/401'),
    hidden: true
  }
] 

// asyncRoutes dynamic routing export const asyncRoutes = [
  {
    path: '/permission',
    component: Layout,
    redirect: '/permission/page',
    alwaysShow: true, 
    name: 'Permission',
    meta: {
      title: 'Permission',
      icon: 'lock',
      // The core code can be traversed by the assigned roles to determine whether to display // This means the two roles of admin and editor. This menu can display roles: ['admin', 'editor']
    },
    children: [
      {
        path: 'page',
        component: () => import('@/views/permission/page'),
        name: 'PagePermission',
        meta: {
          title: 'Page Permission',
          // This means that only admin can display roles: ['admin']
        }
      }
     ]
    }
]

const createRouter = () => new Router({
  scrollBehavior: () => ({ y: 0 }),
  routes: constantRoutes
})

const router = createRouter()

// This is used to reset the router, very useful, don't look at these few lines of code export function resetRouter() {
  const newRouter = createRouter()
  router.matcher = newRouter.matcher 
}

export default router

import { asyncRoutes, constantRoutes } from '@/router'

// This method is used to match roles with route.meta.role function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.includes(role))
  } else {
    return true
  }
}


// This method uses recursion to traverse the routes and traverse the routes with permissions export function filterAsyncRoutes(routes, roles) {
  const res = []

  routes.forEach(route => {
    const tmp = { ...route }
    if (hasPermission(roles, tmp)) {
      if (tmp.children) {
        tmp.children = filterAsyncRoutes(tmp.children, roles)
      }
      res.push(tmp)
    }
  })

  return res
}

const state = {
  routes: [],
  addRoutes: []
}

const mutations = {
  SET_ROUTES: (state, routes) => {
    // This place maintains two states, one is addRouters and the other is routes
    state.addRoutes = routes
    state.routes = constantRoutes.concat(routes)
  }
}

const actions = {
  generateRoutes({ commit }, roles) {
    return new Promise(resolve => {
      let accessedRoutes
      if (roles.includes('admin')) {
        accessedRoutes = asyncRoutes || []
      } else {
        // Core code, pass the route and the obtained role (obtained in the background) in for matching accessedRoutes = filterAsyncRoutes(asyncRoutes, roles)
      }
      // Set the matched and authorized routes to vuex commit('SET_ROUTES', accessedRoutes)
      resolve(accessedRoutes)
    })
  }
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}

// permission.js
router.beforeEach((to, from, next) => {
  if (store.getters.token) { // Check if there is a token
    if (to.path === '/login') {
      next({ path: '/' });
    } else {
        // Determine whether the current user has retrieved all user_info information if (store.getters.roles.length === 0) {
        store.dispatch('GetInfo').then(res => { // Pull info
          const roles = res.data.role;
          // Pass the obtained role in for matching and generate accessible routes store.dispatch('GenerateRoutes', { roles }).then(() => { 
            // Dynamically add accessible routing tables (core code, nothing can be done without it)
            router.addRoutes(store.getters.addRouters)
            
            // hack to ensure addRoutes is complete next({ ...to, replace: true })
          })
        }).catch(err => {
          console.log(err);
        });
      } else {
        next() //When there is user permission, it means that all accessible routes have been generated. If you do not have permission to access, you will automatically enter the 404 page.}
    }
  } else {
    if (whiteList.indexOf(to.path) !== -1) { // In the login-free whitelist, go directly to next();
    } else {
      next('/login'); // Otherwise redirect all to the login page}
  }
})

<!-- layout/components/siderbar.vue -->
<el-menu
:default-active="activeMenu"
:collapse="isCollapse"
:background-color="variables.menuBg"
:text-color="variables.menuText"
:unique-opened="false"
:active-text-color="variables.menuActiveText"
:collapse-transition="false"
mode="vertical"
>
    // Loop through the routes and pass them to the child component as parameters <sidebar-item v-for="route in routes" :key="route.path" :item="route" :base-path="route.path" />
</el-menu>
// Get authorized routes routes() {
  return this.$router.options.routes
}


<!-- layout/components/siderbarItem.vue -->
  <template slot="title">
    <item v-if="item.meta" :icon="item.meta && item.meta.icon" :title="item.meta.title" />
  </template>
  <sidebar-item
    v-for="child in item.children"
    :key="child.path"
    :is-nest="true"
    :item="child"
    :base-path="resolvePath(child.path)"
    class="nest-menu"
  />

  props: {
    // route object
    item:
      type: Object,
      required: true
    },
    isNest: {
      type: Boolean,
      default: false
    },
    basePath: {
      type: String,
      default: ''
    }
  }

GenerateRoutes({ commit }, data) {
  return new Promise((resolve, reject) => {
    getRoute(data).then(res => {
     //Convert the acquired data and save it in vuex const accessedRouters = arrayToMenu(res.data)
      accessedRouters.concat([{ path: '*', redirect: '/404', hidden: true }])
      commit('SET_ROUTERS', accessedRouters)
      resolve()
    }).catch(error => {
      reject(error)
    })
  })
}

// Page routing format {
    path: '/form',
    component: Layout,
    children: [
      {
        path: 'index',
        name: 'Form',
        component: () => import('@/views/form/index'),
        meta: { title: 'Form', icon: 'form' }
      }
    ]
}

// Data format after sorting // First level menu // ParentId 0 can be used as a first level menu. It is best to choose a 4-digit ID. You will know why when you develop the project.
    id: 1300
    parentId: 0
    title: "Menu Management"
    path: "/menu"
    hidden: false
    component: null
    hidden: false
    name: "menu"
},

// Secondary menu // If parentId is not 0, you can match parentId with the id of the primary menu, and push the matching one into children {
    id: 1307
    parentId: 1300
    title: "Submenu"
    hidden: false
    path: "menuItem"
    component: "menu/menuItem" // To match the local file address hidden: false
    name: "menuItem"
}

export function arrayToMenu(array) {
  const nodes = []
  // Get the top node for (let i = 0; i < array.length; i++) {
    const row = array[i]
    // This exists method is to determine whether there is a child if (!exists(array, row.parentId)) {
      nodes.push({
        path: row.path, // route address hidden: row.hidden, // all true, if the backend is not configured component: Layout, // generally matches the component of your file
        name: row.name, // route name meta: { title: row.title, icon: row.name }, // title is the displayed name id: row.id, // route id
        redirect: 'noredirect'
      })
    }
  }
  const toDo = Array.from(nodes)
  while (toDo.length) {
    const node = toDo.shift()
    // Get child nodes for (let i = 0; i < array.length; i++) {
      const row = array[i]
      // push to the parent whose parentId is equal to if (row.parentId === node.id) {
        const child = {
          path: row.path,
          name: row.name,
          hidden: row.hidden,
          // Core code, because the component of the secondary route needs to match the component of the page: require('@/views/' + row.component + '/index.vue'),
          meta: { title: row.title, icon: row.name },
          id: row.id
        }
        if (node.children) {
          node.children.push(child)
        } else {
          node.children = [child]
        }
        toDo.push(child)
      }
    }
  }
  return nodes
}
// Check if there are any children function exists(rows, parentId) {
  for (let i = 0; i < rows.length; i++) {
    if (rows[i].id === parentId) return true
  }
  return false
}