如何将常量变量从一个组件传递到另一个react组件

Question

您好，我正在尝试将阿波罗添加到我的react应用程序中，在文档中它说要将您的应用程序包装在<ApolloProvider client={client}>标记中，并将客户端作为变量传入，如下所示：

import React from 'react';
import ReactDOM from 'react-dom';
import PageLayout from './components/page-layout'
import CreateApolloClient from './apollo-settings'
import { ApolloProvider } from '@apollo/react-hooks';
import ApolloClient from 'apollo-boost';
import {BrowserRouter} from 'react-router-dom';

    const client = new ApolloClient({
        uri: 'http://localhost/headless-cms/admin/',
        fetchOptions: {
            mode: 'no-cors',
        },
    });


ReactDOM.render(<ApolloProvider client={client}><BrowserRouter><PageLayout /></BrowserRouter></ApolloProvider>, document.getElementById('site-wrapper'));

但是，我想从index.js页面中删除const client，并将其移动到另一个模板中，以使内容组织如下：

import React from 'react';
import { ApolloProvider } from '@apollo/react-hooks';
import ApolloClient from 'apollo-boost';

const CreateApolloClient = () => {
    const client = new ApolloClient({
        uri: 'http://localhost/headless-cms/admin/',
        fetchOptions: {
            mode: 'no-cors',
        },
    });
}

export default CreateApolloClient;

我正在努力解决的问题是，在将CreateApolloClient导入index.js页面时，如何访问const客户端并将其传递到<ApolloProvider client={client}>中

感谢您在高级课程中的帮助

Answer 1

您应该在函数中返回apollo客户端实例并导出createApolloClient。

import { ApolloProvider } from '@apollo/react-hooks';
import ApolloClient from 'apollo-boost';

export const createApolloClient = () => {
    return new ApolloClient({
        uri: 'http://localhost/headless-cms/admin/',
        fetchOptions: {
            mode: 'no-cors',
        },
    });
}

export default CreateApolloClient;

import React from 'react';
import ReactDOM from 'react-dom';
import PageLayout from './components/page-layout'
import {createApolloClient} from './apollo-settings'
import {BrowserRouter} from 'react-router-dom';
import { ApolloProvider } from '@apollo/react-hooks';

const client = createApolloClient();

ReactDOM.render(<ApolloProvider client={client}><BrowserRouter><PageLayout /></BrowserRouter></ApolloProvider>, document.getElementById('site-wrapper'));