Question

对于简单的localstorage，我们使用localstorage.length。但我正在使用一个插件localStorageDB，它具有如下所示的JSON输出。我想计算“购物车”商品（'数据' - ＆gt;'购物车'）。

每当我添加Products时，localstorage.length的输出为1。但是，产品会添加到“数据” - >“购物车”中。

{
"tables": {
    "cart": {
        "fields": [
            "ID",
            "item",
            "quantity",
            "cost"
        ],
        "auto_increment": 3
    }
},
"data": {
    "cart": {
        "1": {
            "ID": 1,
            "item": "Nature Fresh Atta Chakki Fresh 10 kg",
            "quantity": "1",
            "cost": "252"
        },
        "2": {
            "ID": 2,
            "item": "Fortune Refined Oil Soya Bean 1 Lt",
            "quantity": "1",
            "cost": "85"
        }
    }
}}

更多信息：我使用'cart.serialize（）'插件语法获得了序列化输出 Screenshot

Answer 1

syntax: Object.keys(obj).length);


var data = {
        "tables": {
            "cart": {
                "fields": [
                    "ID",
                    "item",
                    "quantity",
                    "cost"
                ],
                "auto_increment": 3
            }
        },
        "data": {
            "cart": {
                "1": {
                    "ID": 1,
                    "item": "Nature Fresh Atta Chakki Fresh 10 kg",
                    "quantity": "1",
                    "cost": "252"
                },
                "2": {
                    "ID": 2,
                    "item": "Fortune Refined Oil Soya Bean 1 Lt",
                    "quantity": "1",
                    "cost": "85"
                }
            }
        }
    }

console.log(Object.keys(data['data']['cart']).length);

Answer 2

localStorageDB插件具有内置方法rowCount()，用于计算表格中的条目。

所以，这样的事情应该有效：yourLib.rowCount('cart')

计算localstorage中的键数

2 个答案: