× 错误：元素类型无效：预期为字符串（对于内置组件）或类/函数（对于复合组件）但得到：对象

Question

请帮我解决这个错误： 错误：元素类型无效：需要字符串（对于内置组件）或类/函数（对于复合组件），但得到：对象。 这是我的代码：

index.js: 

import ReactDOM from 'react-dom';
import './index.css'
import reportWebVitals from './reportWebVitals';
import ApolloProvider from './ApolloProvider'

ReactDOM.render(

  <
  ApolloProvider / > ,
  document.getElementById('root')
);
reportWebVitals();

ApolloProvider.js：

import React from 'react'
import App from './App'
import ApolloClient from 'apollo-client'
import {
  InMemoryCache
} from 'apollo-cache-inmemory'
import {
  createHttpLink
} from 'apollo-link-http'
import {
  ApolloProvider
} from '@apollo/react-hooks'

const httpLink = createHttpLink({
  uri: 'http//localhost:5000'
})

const client = new ApolloClient({
  link: httpLink,
  cache: new InMemoryCache()
})

export default ( <
  ApolloProvider client = {
    client
  } >
  <
  App / >
  <
  /ApolloProvider>
);

Answer 1

试试

ReactDOM.render(
  ApolloProvider ,
  document.getElementById('root')
);

或更新提供程序以导出组件

export default function provider() {
return (
  <ApolloProvider client={client}>
    <App />
  </ApolloProvider>
);
}