<template>
  <title>陈尼克</title>
  <div>
     {{ count }} {{ object.foo }}
  </div>
</template>

<script>
//import { defineProps, reactive } from 'vue'

//import { createApp, ref, reactive } from 'vue';
import { ref, reactive, h } from 'vue';
//const { createApp, ref, reactive } = Vue;
//const App = {
  export default {
  setup() {
    const count = ref(0)
    const object = reactive({foo: "bar",});

    return () => h("h1", [count.value, object.foo]);
  },
};
</script>
<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>

返回一个h函数
setup返回的setup函数返回的
大括号里都是参数