我正在寻找一个解决方案，如何正确地持有产品添加到购物车中的会话.目前我解决了这种方式：
page.tsx

const ProductPage = () => {
  const { product, loading, error } = useProductData();
  const { cart, addToCart: addToCartHook } = useCartItems(); // Use the addToCart function from the hook

  const [isCartOpen, setIsCartOpen] = useState(false);

  // Assuming there is an interface for your product/item
interface ProductItem {
  databaseId: number;
  // Other properties...
}

const handleAddToCart = (item: ProductItem) => {
  // Use the addToCart function from the hook
  addToCartHook(item);

  // Add item to WooCommerce cart using GraphQL mutation
  addToCart(item.databaseId, 1); // Assuming quantity is 1, adjust as needed
};

  useEffect(() => {
    // Open the cart when the cart is updated
    if (cart.length > 0) {
      setIsCartOpen(true);
    }
  }, [cart]);

  const handleCloseCart = () => {
    setIsCartOpen(false);
  };

  return (

字符串
这里是hook useCartItems：

export const useCartItems = () => {
  
  // Load cart from localStorage on hook initialization
  const initialCart = JSON.parse(localStorage.getItem('cart')) || [];
  const [cart, setCart] = useState(initialCart);

  // Save cart to localStorage whenever it changes
  useEffect(() => {
    localStorage.setItem('cart', JSON.stringify(cart));
  }, [cart]);

  // Function to add an item to the cart
  const addToCart = (item) => {
    setCart([...cart, item]);
  };

  // Function to clear the entire cart
  const clearCart = () => {
    setCart([]);
  };

  // Function to remove a specific item from the cart
  const removeFromCart = (itemId) => {
    const updatedCart = cart.filter((item) => item.id !== itemId);
    setCart(updatedCart);
  };

  // Calculate cart count
  const cartCount = cart.length;

  return {
    cart,
    cartCount,
    addToCart,
    clearCart,
    removeFromCart,
  };
};

型
这个钩子可以工作并检索购物车中的项目，但问题是这部分函数：constinitialCart = JSON.parse（localStorage.getItem（'cart'））||[的];
这个工作，但nextjs每次返回错误：

ReferenceError: localStorage is not defined
    at useCartItems (./lib/woocommerce/index.ts:454:36)
    at Navbar (./components/layout/navbar/index.tsx:43:96)
  459 |
  460 |   // Load cart from localStorage on hook initialization
> 461 |   const initialCart = JSON.parse(localStorage.getItem('cart')) || [];

型
我不确定我是否应该这样写，或者可能有另一种解决方案。