frontend-admin/src/plugins/iview.js

import Vue from "vue";
import "iview/dist/styles/iview.css";
import { Button, Form, FormItem, Input, Icon, Message, Notice } from "iview";

Vue.component("Button", Button);
Vue.component("Form", Form);
Vue.component("FormItem", FormItem);
Vue.component("Input", Input);
Vue.component("Icon", Icon);
Vue.component("Message", Message);

Vue.prototype.$Message = Message;
Vue.prototype.$Notice = Notice;