[add] first

src/App.vue

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+<script setup>
+// This starter template is using Vue 3 <script setup> SFCs
+// Check out https://v3.vuejs.org/api/sfc-script-setup.html#sfc-script-setup
+import HelloWorld from './components/HelloWorld.vue'
+</script>
+
+<template>
+  <img alt="Vue logo" src="./assets/logo.png" />
+  <HelloWorld msg="Hello Vue 3 + Vite" />
+</template>
+
+<style>
+#app {
+  font-family: Avenir, Helvetica, Arial, sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  text-align: center;
+  color: #2c3e50;
+  margin-top: 60px;
+}
+</style>

src/components/HelloWorld.vue

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+<script setup>
+import { ref } from 'vue'
+
+defineProps({
+  msg: String
+})
+
+const count = ref(0)
+</script>
+
+<template>
+  <h1>{{ msg }}</h1>
+
+
+  <button type="button" @click="count++">count is: {{ count }}</button>
+  <p>
+    Edit
+    <code>components/HelloWorld.vue</code> to test hot module replacement.
+  </p>
+</template>
+
+<style scoped>
+a {
+  color: #42b983;
+}
+</style>

src/main.js

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