在此代码中，而不是显示“产品已添加到购物车”。警报消息，如果购物车中已有商品，我想更新购物车数量，请帮帮我。
const addToCart = (id) => {
const check = cart.every((item) => {
return item.id !== id;
});
if (check) {
const cartData = products.filter((el) => {
return el.id === id;
});
setCart([...cart, ...cartData]);
} else {
alert('The product has been added to cart.');
}
我在这里对您的变量的外观进行一些假设，但是通常，这是您需要的：
const products = [{id: 1, name: 'Prod 1'}, {id: 2, name: 'Prod 2'}, {id: 3, name: 'Prod 3'}, {id: 4, name: 'Prod 4'}]
const cart = [{id: 1, name: 'Prod 1', quantity: 1}, {id: 4, name: 'Prod 4', quantity: 1}];
const addToCart = (id) => {
const check_index = cart.findIndex(item => item.id === id);
if (check_index !== -1) {
cart[check_index].quantity++;
console.log("Quantity updated:", cart);
} else {
cart.push({...products.find(p => p.id === id), quantity: 1})
console.log('The product has been added to cart:', cart);
}
}
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我来说两句