import { asyncRoutes, constantRoutes } from '@/router'
import { fetchUserMenuList } from '@/api/user'
import Layout from '@/layout'

/**
 * 静态路由懒加载
 * @param view  格式必须为 xxx/xxx 开头不要加斜杠
 * @returns 
 */
export const loadView = (view) => {
  return (resolve) => require([`@/views/${view}.vue`], resolve)
}

/**
 * 把从后端查询的菜单数据拼装成路由格式的数据
 * @param routes
 * @param data 后端返回的菜单数据
 */
export function generaMenu(routes, data) {
  data.forEach(item => {
    const menu = {
      path: item.url, 
      component: item.component === '#' ? Layout : loadView(item.component), 
      hidden: item.status === 0, // 状态为0的隐藏
      redirect: item.redirect,
      children: [],
      name: item.code,
      meta: item.meta
    }

    if (item.children) {
      generaMenu(menu.children, item.children)
    }
    routes.push(menu)
  })
  return routes
}

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

const mutations = {
  SET_ROUTES: (state, routes) => {
    state.addRoutes = routes
    // 拼接静态路由和动态路由
    state.routes = constantRoutes.concat(routes)
  }
}

const actions = {
  generateRoutes({ commit }, token) {
    return new Promise(resolve => {
      // 通过token从后端获取用户菜单，并加入全局状态
      fetchUserMenuList(token).then(res => {
        const menuData = Object.assign([], res.data)
        const tempAsyncRoutes = Object.assign([], asyncRoutes)
        const accessedRoutes = generaMenu(tempAsyncRoutes, menuData)

        commit('SET_ROUTES', accessedRoutes)
        resolve(accessedRoutes)
      }).catch(error => {
        console.log(error)
      })
    })
  }
}

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

2.3、在vuex中注册permission模块

? 如果使用的是vue-element-admin请跳过此步，因为它在src\store\index.js中自动注册了src\store\modules下的所有模块。如果你使用的是vue-element-template，可以参考admin，将index.js文件改造一下，也可以手动import一下。

import Vue from 'vue'
import Vuex from 'vuex'
import getters from './getters'

Vue.use(Vuex)

// https://webpack.js.org/guides/dependency-management/#requirecontext
const modulesFiles = require.context('./modules', true, /\.js$/)

// you do not need `import app from './modules/app'`
// it will auto require all vuex module from modules file
const modules = modulesFiles.keys().reduce((modules, modulePath) => {
  // set './app.js' => 'app'
  const moduleName = modulePath.replace(/^\.\/(.*)\.\w+$/, '$1')
  const value = modulesFiles(modulePath)
  modules[moduleName] = value.default
  return modules
}, {})

const store = new Vuex.Store({
  modules,
  getters
})

export default store

menusRoutes: state => state.permission.routes

    routes() {
      // return this.$router.options.routes
      return this.$store.getters.menusRoutes
    },

          // 获取菜单,调用其他文件中actions时必须加 { root: true }
          dispatch('permission/generateRoutes', data, { root: true }).then((accessRoutes) => {
            router.addRoutes(accessRoutes)
          })

          const accessRoutes = await store.dispatch('permission/generateRoutes', store.getters.token)
          router.addRoutes(accessRoutes)
          next({ ...to, replace: true })