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useRef

4. useRef​

📌 範例程式碼​

import { useRef } from "react";

function Demo() {
  const inputRef = useRef(null);

  return (
    <>
      <input ref={inputRef} />
      <button onClick={() => inputRef.current.focus()}>focus</button>
    </>
  );
}

📌 用途​

  1. 操作 DOM
  2. 儲存不會觸發 re-render 的值