传递函数，父组件重新渲染的时候，并不会让子组件跟着重新渲染；

import {  memo, useCallback, useState } from 'react';

const Son = memo(function Input({onChange}){
  console.log('子组件渲染');
  return (
  <div>
    <div onClick={()=>onChange(666)}>222</div>
  </div>
  )
})

const App = () => {
  const [count, setCount] = useState(0);//简单类型
  const changeInput = useCallback((val) => console.log(val),[]);// 只有父组件更新
  // const changeInput = (val) => {console.log(val)} //父组件更新，会导致子组件跟着更新
  console.log('父');
  return (
    <div className="home">
     <Son  onChange={changeInput} />
     <button onClick={() => setCount(count + 1)}>+{count}</button>
    </div>
  )
}

export default App