src/app/hook/useLocalStorage.ts

import { useEffect, useState } from 'react';

export const useLocalStorage = <T>(key: string): T | null => {
  const [value, setValue] = useState<T | null>(null);

  useEffect(() => {
    if (typeof window !== 'undefined') {
      const item = localStorage.getItem(key);
      if (item) {
        try {
          setValue(JSON.parse(item));
        } catch (e) {
          console.error(`解析 localStorage ${key} 失败`, e);
        }
      }
    }
  }, [key]);

  return value;
};