React 基础知识~useRef/ 视频播放

import { useRef, useState } from "react";const Video = () =&gt; {  const [playing, setPlaying] = useState();  const videoRef = useRef();  return (    <div>      <video style="{{" maxwidth: ref="{videoRef}"><source src="./sample.mp4"></source></video><button onclick="{()"> {          if (playing) {            videoRef.current.pause();          } else {            videoRef.current.play();          }          setPlaying((prev) =&gt; !prev);        }}      &gt;        {playing ? "Stop" : "Play"}      </button>    </div>  );};const Example = () =&gt; {  return (          <video></video>&gt;  );};export default Example;