import React, { useEffect, useRef } from 'react'; import Button from '../index'; import ButtonGroup from '../buttonGroup'; import IconButton from '../../iconButton'; const Demo = () => { const ref = useRef(null); const refIB = useRef(null); useEffect(() => { console.log(`ref: `, ref.current); }, [ref.current]); useEffect(() => { console.log(`refIB: `, refIB.current); }, [refIB.current]); return (