【Vue】响应式

<script setup>
  import{ref}from 'vue'
  let counter=ref(10)
  function increase(){
    counter.value++
  }
  function decrease(){
    counter.value--
  }
</script>

<template>
  <button @click="increase">+</button>
  <p id="id1">{{counter}}</p>
  <button @click="decrease">-</button>
</template>

<style scoped>
#id1{
  color: aqua;
  font-size: 40px;
}
</style>

效果图↓