szugift-fe/sourcecode/hello-world/src/main.js

import Vue from 'vue'
import App from './App.vue'
import Vant from 'vant';
import 'vant/lib/index.css';

Vue.use(Vant);
Vue.config.productionTip = false

new Vue({
  render: h => h(App),
}).$mount('#app')