npm方式:

npm install -D unplugin-vue-components unplugin-auto-import

yarn 方式 :

yarn add unplugin-vue-components;
yarn add unplugin-auto-import;

 使用官方的这个：

vite.config.js中配置
plugins: [vue(),AutoImport({resolvers: [ElementPlusResolver()],}),Components({resolvers: [VantResolver(), ElementPlusResolver()],}),],

 LoginDialog.js定义

import {createApp} from 'vue'
import SubDialog from './LoginDialog.vue'/*** 关键函数挂在整个页面上去*/
const createDialog = () => {const mountNode = document.createElement('div')mountNode.setAttribute('id', 'dialog-mask-dialog')const Instance = createApp(SubDialog, {show: true,close: () => {Instance.unmount(mountNode);document.body.removeChild(mountNode);}})document.body.appendChild(mountNode)Instance.mount(mountNode)
}export default createDialog

LoginDialog.vue 定义 

<template><Teleport to="body"><el-dialogv-model="props.show"title="登录"width="500px"center><el-form :model="loginForm" :rules="formDataRule" ref="formRef" label-width="120px"><el-form-item label="用户名" prop="phone"><el-input v-model="loginForm.phone" placeholder="输入手机号"/></el-form-item><el-form-item label="验证码" prop="verifyCode"><div style="display: inline-block"><el-input v-model="loginForm.verifyCode" placeholder="输入验证码"/></div><div style="display: inline-block"><el-button>获取验证码</el-button></div></el-form-item><el-form-item><el-button type="primary" @click="submitLogin(formRef)">登录</el-button></el-form-item></el-form></el-dialog></Teleport>
</template><script setup>
import {reactive, ref} from "vue";const formRef = ref(null)const loginForm = reactive({phone: '',verifyCode: ''
})const formDataRule = {phone: [{required: true, message: '手机号不能为空', trigger: 'blur'}],verifyCode: [{required: true, message: '验证码不能为空', trigger: 'blur'}]
}const props = defineProps({show: {type: Boolean,default: false}
})const submitLogin = (ref) => {ref.validate((valid) => {if (valid) {console.log('submit!')} else {console.log('error submit!')return false}})
}</script><style scoped></style>