关于react useState更新异步问题

const [page, setPage] = useState(1);
const handlerClick = (e)=>{
    setPage(e.current);
    console.log(page);
}

 setPage(e.current);
        setPage(prevFoo => {
            console.log('page===========',prevFoo);//page=========== 2
            return prevFoo;
 });

    const useSyncCallback = callback => {
        const [proxyState, setProxyState] = useState({ current: false });
        const Func = useCallback(() => {
          setProxyState({ current: true });
        }, [proxyState]);
        useEffect(() => {
          if (proxyState.current === true) {
            setProxyState({ current: false });
          }
        }, [proxyState]);
        useEffect(() => {
          proxyState.current && callback();
        });
        return Func;
      };
      const funcqq = useSyncCallback(() => {
        console.log('page===========',page);//page=========== 2
      });
//调用
setPage(e.current);
funcqq()

function useCurrentValue(value) {
    const ref = useRef(value);
    useEffect(() => {
      ref.current = value;
    }, [value]);
    return ref;
}
//调用
 const log = () => {
    setCount(count + 1);
    setTimeout(() => {
      console.log(currentCount.current);
    }, 3000);
  };

const [count,setCount] = useState(1)
useEffect(()=> {
    setCount(2,()=>{
      console.log('测试hooks的回调');
    })
    console.log(count);
  },[])

const [count,setCount] = useState(1)
useEffect(()=> {
    setCount(2)
    console.log(count);
  },[count])

  useEffect(()=> {
    let currentValue = null
      setCount((preVal)=>{
        currentValue=preVal
        return 2
      })
      if(currentValue!==count){
        console.log(count);
      }
    },[count])