在router/index.js初始化router

import VueRouter from "vue-router";
import Vue from "vue";
import Book from "@/components/Book";
import Music from "@/components/Music";

// 将VueRouter设置为Vue的插件
Vue.use(VueRouter)

const router = new VueRouter({
    routes: [
        {path:'/book', component: Book},
        {path:'/music', component: Music},
    ]
})

export default router

在main.js中导入router

import router from "@/router";
new Vue({
  render: h => h(App),
  router: router,
}).$mount('#app')