React.Children.only只会收到一个React元素的子错误 [英] React.Children.only expected to receive a single React element child error

问题描述

我从以下代码中得到 React.Children。只希望收到一个React元素的孩子。

I'm getting 'React.Children.only expected to receive a single React element child.' from the following code.

我已经使用create-react-app创建了一个新的react应用，并安装了redux和react-redux，并创建了一个简单的reducer并创建了商店。

I have created a new react app using create-react-app and installed redux and react-redux, and created a simple reducer and creating store with that.

import React from "react";
import ReactDOM from "react-dom";
import { createStore, combineReducers } from "redux";
import { Provider } from "react-redux";

import logo from './logo.svg';
import './App.css';

class App extends React.Component {
  render() {
    return (
      <div className="App">
        <div className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h2>Welcome to React</h2>
        </div>
        <p className="App-intro">
          To get started, edit <code>src/App.js</code> and save to reload.
        </p>
      </div>
    );
  }
}


function productReducer(state = [], action) {
  return state;
}

const store = createStore(
  productReducer
);

ReactDOM.render((<Provider store={store}><App /> </Provider>), document.getElementById('root'));

推荐答案

您在此处有空格：

                               ↓
<Provider store={store}><App /> </Provider>

JSX对单行间距有点挑剔。上面的内容基本上解释为：

JSX is kinda picky about spacing on single lines. The above essentially gets interpreted as:

<Provider store={store}><App />{' '}</Provider>

（实际上，更漂亮会产生几乎这个确切输出）

您可以删除空格：

<Provider store={store}><App /></Provider>

或将其分解为多行：

<Provider store={store}>
    <App />
</Provider>

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