Question

我在localStorage中有5个项目，但是，当我尝试输出所有文件时，

仅输出2个项目，而不是全部。

放入localStorage的JS：

$(document).ready(function () {
    $.fn.SaveToCart = function (id, iName, iAlbum, iPrice) {
        var quantity = 0;
        if (localStorage.getItem('Product_' + id) === null) {
            quantity = 1;
        } else {
            var tempItem = JSON.parse(localStorage.getItem('Product_' + id));
            var tempQuantity = parseInt(tempItem['quantity']);
            quantity = tempQuantity + 1;
        }
        var cartItem = {
            'quantity': quantity,
            'name': iName,
            'album': iAlbum,
            'price': iPrice
        }
        localStorage.setItem('Product_' + id, JSON.stringify(cartItem));
    };

购物车JS：

function ShoppingCart() {

    var output;
    var productName;
    var productAlbum;
    var productQuantity;
    var productPrice;
    var productSubTotal = 0;
    var totalPrice;


    for (var i = 0; i < localStorage.length - 1; i++) {
        var keyName = localStorage.key(i);
        if (keyName.indexOf('Product_') == 0) {
            var product = localStorage.getItem(keyName);

            var product = localStorage.getItem('Product_' + i);

            var result = JSON.parse(product);

            totalPrice = 0;
            productName = result.name
            productAlbum = result.album;
            productQuantity = parseInt(result.quantity);
            productPrice = parseFloat(result.price).toFixed(2);
            productSubTotal = parseInt(productQuantity) * parseFloat(productPrice).toFixed(2);

            outputName = "<div id='cart-table'><table><tr><td><b>NAME: </b>" + productName + "</td></tr></div>";
            outputAlbum = "<tr><td><b>ALBUM: </b>" + productAlbum + "</td></tr>";
            outputQuantity = "<tr><td><b>QUANTITY: </b>" + productQuantity + "</td></tr>";
            outputPrice = "<tr><td><b>PRICE: </b> EUR " + productPrice + "</td></tr>";
            outputSubTotal = "<tr><td><b>SUB-TOTAL: </b> EUR " + productSubTotal + "</td></tr></table><br><br>";


            var TotalOutput = outputName + outputAlbum + outputQuantity + outputPrice + outputSubTotal;

            document.getElementById("Cart-Contents").innerHTML = document.getElementById("Cart-Contents").innerHTML + TotalOutput;
            totalPrice += parseFloat(totalPrice) + parseFloat(productSubTotal);
            productSubTotal = productSubTotal + productSubTotal;
        }
        i++;


    }
    totalPrice = productSubTotal;

    localStorage.setItem("price", totalPrice);

    var outputTotal = "<br><br><h1><table><tr><td><b>TOTAL:</b> EUR " + totalPrice + "</td></tr></table></h1>";
    document.getElementById("total-price").innerHTML = document.getElementById("total-price").innerHTML + outputTotal;


}

function ClearCart() {

    localStorage.clear();
    document.location.reload(true);

}

window.onload = ShoppingCart;

    </script>

HTML：

<div id="Cart-Contents"></div>
<div id="total-price"></div>

另外，我还有另一个问题，总价格没有正确计算。我得到28.12，总计14.06 + 16.40。这是怎么回事？

给你一个想法：

http://i.imgur.com/RmftSoU.png

http://i.imgur.com/qO8FQN8.png

Answer 1

将您的for循环更改为：for (var i = 0; i < localStorage.length; i++){。

不要将i++;添加到循环体的末尾。

由于各种原因，两者都会导致你的循环没有击中所有项目。

某些localStorage项目未显示

1 个答案: