你需要这样的东西：

const [sentence, setSentence] = useState("First sentence");
  const intervalRef = useRef(null);

  useEffect(() => {
    intervalRef.current = setInterval(() => {
      if (sentence === "First sentence") {
        setSentence("Second sentence");
      } else {
        setSentence("First sentence");
      }
    }, 2000);

    // Clear the interval
    setTimeout(() => {
      clearInterval(intervalRef.current);
    }, 11000); // Setting 11 because it would stop before the final change if it was 10

    return () => clearInterval(intervalRef.current);
  }, [sentence]);

  return <div>{sentence}</div>;

这将每2秒改变一次句子，总共10秒。使用ref就像一个计数器。