javascript - 在 JavaScript 中，如何获取数组内对象的值

Question

嗨，我正在用 JavaScript 编写一个函数

问题:定义一个不接受任何参数的函数viewCart。此函数应循环购物车中的每个商品以打印出“您的购物车中有[商品和价格对]。”。如果您的购物车中没有任何东西，该函数应该打印出“您的购物车是空的。”。

这就是我所拥有的

var cart = [];

function setCart(newCart) {
    cart = newCart;
}

function getCart() {
    return cart;
}

function addToCart(item) {
    var price = Math.floor(Math.random() * 10);
    cart.push({
        item: price
    });
    console.log(item + " has been added to your cart.");
    return cart;
}

function viewCart() {
    if (cart.length != 0) {
        var newArray = [];
        for (var i = 0, l = cart.length; i < l; i++) {
            var ItemPriceObj = cart[i];
            var item = Object.keys(ItemPriceObj);
            var price = ItemPriceObj['item'];
            newArray.push(` ${item} at \$${price}`)
        }
        console.log(`In your cart, you have ${newArray}.`);
    } else {
        return console.log('Your shopping cart is empty.');
    }
}

我的输出:

'In your cart, you have socks at $undefined, puppy at $undefined, iPhone at $undefined.'

想要的输出:

'In your cart, you have socks at $3, puppy at $23, iPhone at $400.'

Answer 1

来自 Tibrogargan 的评论:

function viewCart() {
    if (cart.length != 0) {
        var newArray = [];
        for (var i = 0, l = cart.length; i < l; i++) {
            var ItemPriceObj = cart[i];
            var item = Object.keys(ItemPriceObj);
            var price = ItemPriceObj['item'];
            newArray.push("" + item + " at $" + price)
        }
        console.log("In your cart, you have " + newArray.join(","));
    } else {
        return console.log('Your shopping cart is empty.');
    }
}

使用“插值字符串”在 Javascript 中无效，您必须将它们连接起来