不要依赖于设置延迟为5000ms的setTimeOut函数，考虑使用时间戳。您可以将时间戳保存在localStorage中，然后与当前时间戳进行比较。如果差值等于或大于5000ms，则重新启用按钮。以下是完整的代码和我的实现：

import React, { useEffect, useState } from "react";

function Without() {
  const [count, setCount] = useState(3);
  const [disable, setDisable] = useState(false);

  const handleDec = () => {
    if (count > 1) {
      setCount(count - 1);
    } else {
      setCount(0);
      setDisable(true);
      const timestamp = new Date().getTime(); // 获取当前时间戳
      localStorage.setItem("disabledTimestamp", timestamp);
    }
  };

  // 检查按钮被禁用后是否已经过了5秒
  useEffect(() => {
    const disabledTimestamp = localStorage.getItem("disabledTimestamp");
    if (disabledTimestamp) {
      const currentTime = new Date().getTime();
      const fiveSecondsInMillis = 5000;
      const difference = currentTime - parseInt(disabledTimestamp, 10);

      if (difference < fiveSecondsInMillis) {
        setDisable(true);
        const timeout = setTimeout(() => {
          setDisable(false);
          setCount(3);
          localStorage.removeItem("disabledTimestamp"); // 重新启用按钮后重置时间戳
        }, fiveSecondsInMillis - difference);

        return () => clearTimeout(timeout);
      } else {
        setDisable(false);
        localStorage.removeItem("disabledTimestamp"); // 如果超过5秒则重置时间戳
      }
    }
  }, [disable]);

  // LOCALSTORAGE
  useEffect(() => {
    const storedCount = localStorage.getItem("count");
    if (storedCount) {
      setCount(parseInt(storedCount));
    }
  }, []);

  return (
    <div>
      <h3>{count} / 3</h3>
      <button disabled={disable} onClick={handleDec}>
        剩余使用次数
      </button>
    </div>
  );
}

export default Without;

您只需要为'0'设置一个额外的if语句检查来禁用。您已经正确地存储了该值。

//LOCALSTORAGE
  useEffect(() => {
    const storedCount = localStorage.getItem('count');
    console.log("storedcount: ", storedCount);
    if (storedCount) {
      setCount(parseInt(storedCount));
      if (storedCount === '0') {
        setDisable(true);
      }
    }
  }, []);