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>