小编Oma*_*mar的帖子

返回错误：./src/index.js 尝试导入错误：“./App”不包含默认导出（作为“App”导入）。

import React, { Component, useState } from "react";

const App = () => {
    const [count, setCount] = useState(0);

  const  increment = () => {
        setCount(count + 1);
    };

    return (
      <div>
          <h2> counter app </h2>
          <button onClick={increment}>Clicked {count} times</button>
      </div>
    );
};

指数

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';


ReactDOM.render(<App />, document.getElementById('root'));