不能给 useRef 的 current 属性赋值，提示以下错误信息：
Cannot assign to ‘current’ because it is a read-only property.（不能给current属性复制，因为它是一个只读属性。）

代码如下所示：

let cameraMediaStream = useRef<MediaStream>(null);/*** 打开摄像头**/
const openCamera = async (cameraId = curCameraId) => {try {// 关闭已打开的摄像头if (cameraMediaStream) await closeCamera();// Cannot assign to 'current' because it is a read-only property.cameraMediaStream.current = await ImageCapture.openCamera({ cameraId, video: videoRef.current, width, height });}catch (err: any) {// 错误信息提示...}
}

解决方案：将 current 属性变为非只读属性，useRef 的泛型参数中增加【| null】即可把 current 属性变为非只读属性。

let cameraMediaStream = useRef<MediaStream | null>(null);