//eg1:

 const MSite = resolve => require.ensure([], () =>resolve(require(['myComponent.vue'])) 

 //eg2  需要syntax-dynamic-import插件

 const MSite = () => import('../pages/MSite/MSite.vue') //异步加载

 //import MSite from '../pages/MSite/MSite.vue' 同步加载

 // 声明使用插件

 Vue.use(VueRouter)

 export default new VueRouter({

   routes: [

     {

         path: '/msite',

         // 返回路由组件的函数, 只有执行此函数才会加载路由组件, 这个函数在请求对应的路由路径时才会执行

         component: MSite,   

 export default {

     beforeCreate () {

         import('dayjs').then(module => {

             this.dayjs = module;

         });

     },

     data () {

         return {

             dayjs: null

         }

     }

import utiljs from 'utiljs'

export default {

      data () {},

      mounted () {}

}