reactjs - Apollo react 变量在导入到另一个文件时不起作用!为什么？

Question

src/another_folder/reactiveVarInitializationFile.js
从“@apollo/client”导入 {makeVar}
export const selectStore = makeVar('')
//我的组件

import {Select,Spin} from "antd"
import {selectStore} from "../../reactives/selectStore.RV"
import {useQuery} from "@apollo/client"
import FETCH_STORES from "../../queries/getStoresSelectSoreDPD"
export default function(){
    const {data}= useQuery(FETCH_STORES)
    const store = selectStore()
    const onChange=(val)=>{
        console.log(val)
        selectStore(val)
    }
    console.log(store)
    return(
    <>
        {!data?(<Spin/>):(
            <Select
                style={{width:"200px"}}
                placeholder="Select store" 
                onChange={onChange}>
                {data.currentUser.outlets.map(el=><Select.Option key={el.id} value={el.id}>{el.name} 
               </Select.Option>)}        
            </Select>
            
        )}
        <p>{store}</p>
    </>
    )
}

问题是当我将 selectStore 导入我的组件时，我无法通过 selectStore() 获取其值或通过执行 selectStore("new value") 来修改 var
有人可以帮我吗？

Answer 1

如果直接使用reactiveVar，它不会在值改变时更新，它只会在初始渲染时更新。
但是，如果您希望它在值更改时更新并触发重新渲染，则需要使用 useReactiveVar Hook :https://www.apollographql.com/docs/react/local-state/reactive-variables/
所以，像这样:

const store = useReactiveVar(selectStore);