React-Hook

import React, { useState } from 'react';

// Hook 写法

function App2 () {
  const [count,setCount] = useState(0)
  return (
    <div>
      <h2>点击{count}</h2>
      <button onClick={() => {setCount(count+1)}}>点击</button>
    </div>
  )
}
export default App2