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https://reactjs.org/warnings/special-props.html Special Props Warning – React A JavaScript library for building user interfaces reactjs.org https://stackoverflow.com/questions/42261505/getting-error-message-li-key-is-not-a-prop Getting error message "li: 'key' is not a prop" I'm working with React (version 15.4.2), and I'm populating a dynamically with query results from my database. I thought t..

import { useRef, useState } from "react"; 사용할 Ref를 선언을 해준뒤 const authorInput = useRef(); const contentInput = useRef(); focus를 주고 싶을 때 사용한다. authorInput.current.focus(); contentInput.current.focus(); focus를 적용시킬 tag에 ref를 등록한다.