如何在Vue3单文件组件实例之间共享数据？

import { reactive } from 'vue';

const store = reactive({
  sharedData: '共享的数据'
});

export default store;

import store from './store.js';

export default {
  data() {
    return {
      sharedData: store.sharedData
    };
  },
  // ...
};

import store from './store.js';

export default {
  methods: {
    updateSharedData() {
      store.sharedData = '更新后的共享数据';
    }
  },
  // ...
};