javascript - 如何查看某个键是否包含值并将该键返回 2 级？亚历克斯/JS

Question

我想查看某个类别是否在包中，如果是，则返回该包名称。

因此，如果我的字符串是“Pack1category1”，我想返回“pack1”。

我怎样才能做到这一点？

{
    "paidTier": {
        "categoryPacks": {
            "pack1": {
                "categories": [
                    "Pack1category1",
                    "Pack1category2",
                    "Pack1category3",
                    "Pack1category4",
                    "Pack1category5",
                    "Pack1category6"
                ]
            },
            "pack2": {
                "categories": [
                    "Pack2category1",
                    "Pack2category2",
                    "Pack2category3",
                    "Pack2category4",
                    "Pack2category5",
                    "Pack2category6"
                ]
            }
        }
    }
}

类似这样的事情:

var string = 'Pack1category1'
//Loop through paidTier and find string
return 'pack1';

或

var string = 'Pack2category5'
//Loop through paidTier and find string
return 'pack2';

我已经这样做了至少 10 个小时，我尝试过的每一种方法都失败了。请帮忙!哈哈

Answer 1

既然您提到使用 for 循环来遍历对象，我就为您提供一种使用这种方式的方法。我们将使用for ... in遍历 paidTier.cateroryPacks 对象和 Array.includes()检查内部 categories 数组是否包含搜索到的字符串。

const data = {"paidTier":{"categoryPacks":{"pack1":{"categories":["Pack1category1","Pack1category2","Pack1category3","Pack1category4","Pack1category5","Pack1category6"]},"pack2":{"categories":["Pack2category1","Pack2category2","Pack2category3","Pack2category4","Pack2category5","Pack2category6"]}}}};

function getPack(catPacks, str)
{
    for (const pack in catPacks)
    {
        if (catPacks[pack].categories.includes(str))
            return pack;
    }

    return "No Pack Found!";
}

let catPacks = data.paidTier.categoryPacks;
console.log("Result for Pack1category1:", getPack(catPacks, "Pack1category1"));
console.log("Result for Pack2category5:", getPack(catPacks, "Pack2category5"));
console.log("Result for Pack3category5:", getPack(catPacks, "Pack3category5"));

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