vue 动态路由（从后台查询菜单绑定菜单栏）

1.router/index.js 保留基本路由

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

Vue.use(Router)

/* Layout */
import Layout from '@/layout'
export const constantRoutes = [
  {
    path: '/login',
    component: () => import('@/views/login/index'),
    hidden: true
  },

  {
    path: '/404',
    component: () => import('@/views/404'),
    hidden: true
  },
  {
    path: '/',
    component: Layout,
    redirect: '/',
    name: 'Home',
    hidden: true,
    children: [
      {
        path: '/',
        name: 'Home',
        component: () => import('@/views/home/index'),
        meta: { title: '首页' },
      },
      {
        path: 'info',
        name: 'info',
        component: () => import('@/views/home/info'),
        meta: { title: '个人信息' },
      },
      {
        path: 'resivepsd',
        name: 'resivepsd',
        component: () => import('@/views/home/resivepsd'),
        meta: { title: '修改密码' },
      },
    ]
  },
  ]
  const createRouter = () => new Router({
  // mode: 'history', // require service support
  scrollBehavior: () => ({ y: 0 }),
  routes: constantRoutes
})

const router = createRouter()

export function resetRouter() {
  const newRouter = createRouter()
  router.matcher = newRouter.matcher // reset router
}

export default router

2.获取用户菜单（从后台请求来的数据），请求来的数据格式如dataaa这种json数组类型，通过addRoutes动态添加路由

  getMenu({ commit, state }) {
    return new Promise((resolve, reject) => {
      getMenu(state.token).then(response => {
        console.log(response)
        const { data } = response
        // console.log(data)
        var dataaa =[
          {
            "path": "/users",
            "component": "Layout",
              "title": "首页2",
            "name":'usr',
              "children": [
                {
                  "path": "Form",
                  "component": "/usermanage/RolesManage",
                    "title": "表单1",
                    "name":'RolesManage',
                    "children":[],
                },
                {
                  "path": "dashboard",
                  "component": "/usermanage/UserManage",
                    "title": "首页1",
                    "children":[],
                    "name":'UserManage',
            },
              ]
          },
          {
            "path": "/users",
            "component": "Layout",
              "title": "首页2",
            "name":'usr',
              "children": [
                {
                  "path": "Form",
                  "component": "/usermanage/RolesManage",
                    "title": "表单1",
                    "name":'RolesManage',
                    "children":[],
                },
                
              ]
          }]
        const routers = filterAsyncRouter(dataaa)
        console.log(routers)
        router.addRoutes(routers)
        // console.log(router)
        var ggg = router.options.routes.concat(routers)
        // console.log(ggg)
        router.options.routes = ggg
        router.options.routes.push(
          { path: '*', redirect: '/404', hidden: true },
        )
        if (!data) {
          Message({
            message: response.message,
            type: 'error',
            duration: 5 * 1000
          })
        }
        commit('SET_MENULIST', data)
        resolve(data)
      }).catch(error => {
        reject(error)
      })
    })
  },

3.遍历后台传来的路由字符串，转换为组件对象，import导出不接受变量，所以要用字符串拼接的形式

// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter(asyncRouterMap) {
  const accessedRouters = asyncRouterMap.filter(route => {
    if (route.component) {
      route.meta = {title: route.title}
      if (route.component === 'Layout') {
        route.component = Layout
      } else {
        var aa = route.component      // 先输出再在导入里使用
        route.component = () => import(`@/views${aa}`)
      }
    }
    if (route.children && route.children.length) {
      route.children = filterAsyncRouter(route.children)
    }
    return true
  })

  return accessedRouters
}

4.核心在src目录下的permission.js中，路由注册时候加上 next({ …to, replace: true }) // hack方法 确保addRoutes已完成 ,否则刷新会出现空白。

import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import { getToken } from '@/utils/auth' // get token from cookie
import getPageTitle from '@/utils/get-page-title'

// const _import = require('./router/_import_' + process.env.NODE_ENV) // 获取组件的方法
NProgress.configure({ showSpinner: false }) // NProgress Configuration

const whiteList = ['/login'] // no redirect whitelist

router.beforeEach(async(to, from, next) => {
  // start progress bar
  NProgress.start()

  // set page title
  document.title = getPageTitle(to.meta.title)

  // determine whether the user has logged in
  const hasToken = getToken()

  if (hasToken) {
    if (to.path === '/login') {
      // if is logged in, redirect to the home page
      next({ path: '/' })
      NProgress.done()
    } else {
      const hasGetUserInfo = store.getters.name
      if (hasGetUserInfo) {
        next()
      } else {
        try {
          // get user info
          await store.dispatch('user/getInfo')
          // get user menu
          await store.dispatch('user/getMenu')
          next({
              ...to,
              replace: true
          })    // hack方法 确保addRoutes已完成 ,set the replace

          // next()
        } catch (error) {
          // remove token and go to login page to re-login
          await store.dispatch('user/resetToken')
          Message.error(error || 'Has Error')
          next(`/login?redirect=${to.path}`)
          NProgress.done()
        }
      }
    }
  } else {
    /* has no token*/

    if (whiteList.indexOf(to.path) !== -1) {
      // in the free login whitelist, go directly
      next()
    } else {
      // other pages that do not have permission to access are redirected to the login page.
      next(`/login?redirect=${to.path}`)
      NProgress.done()
    }
  }
})

router.afterEach(() => {
  // finish progress bar
  NProgress.done()
})