如何获取一个特定JSON密钥的值

Question

我在很多地方都在寻找这个问题的答案。但是，我唯一能找到的是如何获取JSON文件中所有特定键的值。我想知道是否有办法获得一个特定密钥的值。我有一个JSON文件设置如下：

{
"Category": [{
    "Subcategory": {
        "Item1": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3",
            "key4": "value4",
            "key5": "value5",
            "key6": "value6"
        },
        "Item2": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3",
            "key4": "value4",
            "key5": "value5",
            "key6": "value6"
            }
        }    
    }]
}

我想知道一个使用JQuery / Javascript获取的方法，例如，Item1（value1）中Key1的值。

Answer 1

您可以这样做：

Category[0].Subcategory.Item1.key1

Answer 2

与其他评论和答案一样，您可以轻松获取特定硬编码密钥的值，如下所示：

Category[0].Subcategory.Item1.key1

但是如果你有动态键，你可以这样做：

var categories = {
    "Category": [{
        "Subcategory": {
            "Item1": {
                "key1": "value1",
                "key2": "value2",
                "key3": "value3",
                "key4": "value4",
                "key5": "value5",
                "key6": "value6"
            },
            "Item2": {
                "key1": "value1",
                "key2": "value2",
                "key3": "value3",
                "key4": "value4",
                "key5": "value5",
                "key6": "value6"
            }
        }
    }]
};

var itemKeyName = "Item1";
var keyName = "key1";

console.log(categories.category[0].Subcategory[itemKeyName][keyName];