vue3写法

main.js

import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
createApp(App).use(router).mount('#app')

router/index.js

import { createRouter,createWebHistory } from "vue-router";
import HelloWorld from '../components/HelloWorld.vue';
const router = createRouter({
    history:createWebHistory(),
    routes:[
        {
            path:'/',
            component:HelloWorld,
        }
    ]
})
export default router;

hellow.vue

<template>
  <div class="hello">
    我是第一个路由组件
  </div>
</template>

<script>
export default {
  name: 'HelloWorld'
}
</script>

<style scoped>
</style>