Vue3 setup lang="ts"

<script setup lang="ts">
import { ref } from 'vue'; // 반응형 함수

const counter = ref(0)

const increment = () => {
  counter.value++
}

const decrement = () => {
  counter.value--
}
</script>

<template>
	<div>
    	<p>Count: {{ counter }}</p>
    	<button @click="increment">Increment</button>
    	<button @click="decrement">Decrement</button>
    </div>
</template>

카운트 증/감 버튼 생성