vue3.x中vue4.x如何使用modules模块化

store/modules/a.js

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export default {
    namespaced: true,
    state: () => ({
    }),
    getters: {
    },
    actions: {
      async getData ({state, commit, dispatch, rootState}) {
        await ajax()
        ...
      }
    },
    mutations: {
    },
}

store/modules/index.js

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import a from './a.js'
...

export default {
    a,
    ...
}

store/index.js

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import { createStore } from 'vuex'
import modules from './modules'

const store = createStore({
  modules, // 模块

  state: {}, // 全局

  mutations: { }, // 全局

  actions: { }, // 全局

  getters: { } // 全局
})

export default store

调用

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import { onMounted } from 'vue'
import { useStore } from 'vuex'

const store = useStore()

onMounted(() => {
  store.dispatch('a/getData')
})