javascript - 使用javascript访问对象内部的数组？

Question

假设这个 JSON 保存在一个名为 response 的变量中:

{
    "brands": {
        "Honda": [
          "Accord",
          "Civic"
        ],

        "Porsche": [
          "Cayenne",
          "Cayman"
        ]
    }
}

我想访问每个品牌内的模型，例如:

for ( var car_brands in response.brands ) {
    console.log(car_brands); // would console Honda, Porsche etc.
}

那么我该如何为每个 car_brands 获取模型(每个 car_brand 内的数组)，即同一循环中的 Accord civic。

也许我应该正确构建 JSON 以使其更易于解析。

Answer 1

您可以使用属性索引器语法获取该值:

var car_brandsArray = response.brands[car_brands]

然后你可以用 for 循环遍历它们:

for ( var car_brands in response.brands ) {
    console.log(car_brands); // would console Honda, Porsche etc.
    var car_brandsArray = response.brands[car_brands];
    for (var i = 0; i < car_brandsArray .length; i++) {
        console.log(car_brandsArray[i]; // would console Accord, Civi
    }
}

或者当然，立即记录数组:

for ( var car_brands in response.brands ) {
        console.log(car_brands); // would console Honda, Porsche etc.
        var car_brandsArray = response.brands[car_brands];
        console.log(car_brandsArray);
    }