问预加载器vue.js工作中的几个问题

EN

import Vue from 'vue';
import Loading from 'vue-loading-overlay';
import 'vue-loading-overlay/dist/vue-loading.css';

Vue.use(Loading);

let loader = Vue.$loading.show({
    loader: 'dots',
    color: '#5D00FF',
    zIndex: 999,
}); 
function loaderStart() {
    loader;
}
function loaderEnd() {
    loader.hide();
}

export default {loaderStart, loaderEnd}

import Vue from 'vue'
import Router from 'vue-router'
import Authorization from '@/components/Authorization'
import Main from '@/components/Main'
import loader from './loader'

Vue.use(Router)

const router = new Router({
    routes: [
    {
        path: '/',
        name: 'Main',
        component: Main,
    },
    {
        path: '/authorization',
        name: 'Authorization',
        component: Authorization
    }
  ]
})
router.beforeResolve((to, from, next) => {
    if(to.path) {
        loader.loaderStart()
    }
    next()
});
router.afterEach((to, from) => {
    loader.loaderEnd()
});
export default router;