用框架插入一个div生成vue3生成vue3格式 script setup代码要求所有方法或箭头函数都用function定义要求所有变量为ref响应式无需任何文字说明只要源码即可

<div id="app"></div>
<script>
  const { createApp, ref } = Vue;
  
  const app = createApp({
    setup() {
      const count = ref(0);
      
      function increment() {
        count.value++;
      }
      
      function decrement() {
        count.value--;
      }
      
      return {
        count,
        increment,
        decrement
      };
    }
  });
  
  app.mount('#app');
</script>