这篇文章主要介绍“vue3在setup中怎么使用mapState”，在日常操作中，相信很多人在vue3在setup中怎么使用mapState问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”vue3在setup中怎么使用mapState”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

vue3 setup使用mapState

创建一个hook

hooks/useMapState.ts

import { computed } from "vue"
import { mapState, useStore } from "vuex"
export default function (state:any) {
    // 1. 获取实例 $store
    const store = useStore()
    // 2. 遍历状态数据
    const storeStateFns = mapState(state)
    // 3. 存放处理好的数据对象
    const storeState = {}
    // 4. 对每个函数进行computed
    Object.keys(storeStateFns).forEach(fnKey => {
        const fn = storeStateFns[fnKey].bind({ $store: store })
        // 遍历生成这种数据结构 => {name: ref(), age: ref()}
        storeState[fnKey] = computed(fn)
    })
    return storeState
}

使用

<script lang="ts" setup>

import useMapState from "@/hooks/useMapState"

const myState:any = useMapState({
  includeList: (state: any) => state.keepAlive.includeList
})
const { includeList } = myState
</script>

vue3 setup语法糖中使用mapState

在Vue的组件中，要想使用Vuex中的多个State，我们经过会借助mapState辅助函数进行获取值，但是在Vue3中，通过computed的来获取多个值的方法官方并未提供，话不多说，直接上代码。

useMapState.js

import { computed } from "vue";
import { mapState, useStore } from "vuex"

export const useMapState = (getKeys) => {

    const store = useStore();
    
    const storeState = {}
    const storeFns = mapState(getKeys)

    Object.keys(storeFns).forEach((fnKeys) => {
        const fn = storeFns[fnKeys].bind({$store: store})
        storeState[fnKeys] = computed(fn)
    })

    return storeState
}

在setup函数中使用

<script>
import { useMapState } from ''./Hooks/useMapState.js'

export default {
    setup() {
        const storeState = useMapState(['title', 'counter'])

        return {
            ...storeState
        }
    }
}

</script>

在setup语法糖中由于不能使用 return进行返回，所以只能按照如下方式写了

在setup语法糖中使用

<script setup>
import { useMapState } from ''./Hooks/useMapState.js'

const { title, counter } = useMapState(['title', 'counter'])

</script>