This function could be called from a button on the product page, or from anywhere else on the website where the user can add a product to the shopping cart.
function addToCart(productId) {
// Get the current contents of the shopping cart.
const cartItems = JSON.parse(localStorage.getItem('cartItems')) || [];
// Add the new product to the shopping cart.
cartItems.push({
id: productId,
quantity: 1,
});
// Save the updated shopping cart to local storage.
localStorage.setItem('cartItems', JSON.stringify(cartItems));
// Show a success message to the user.
alert('Product added to cart!');
}
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