const Div = (props: { key: any, ref: any }) => {
useEffect(() => {
// 打印为 undefined
console.log(props.key);
console.log(props.ref);
}, [])
return (
<div></div>
)
}
export default function App() {
const ref = useRef();
return (
<Div
key={1}
ref={ref}
/>
)
}