如何获取特定值以从嵌套对象创建数组

Question

我有这个下面的对象结构，现在有3条记录作为示例。但是我们将拥有20多个记录。

{
    "data": [{
            "datatype": "AccessoryProduct",
            "values": {
                "identifier": "access8770009prd",
                "shortdescription": "<p>Hybrid Dual Injection Cover and a Tempered Glass.<\/p>",
                "displayname": "Protection Essentials Bundle - Samsung Galaxy S9 (Clear) 822445132623"
            }
        },
        {
            "datatype": "AccessoryProduct",
            "values": {
                "identifier": "access8530068prd",
                "shortdescription": "String.class",
                "displayname": "JBL UA Flex Headphones (Gray) - 050036342735"
            }
        }, {
            "datatype": "AccessoryProduct",
            "values": {
                "identifier": "access8630012prd",
                "shortdescription": "<p>This slim case has everything you want - style and protection.<\/p>",
                "displayname": "Otterbox Symmetry Series Case - Samsung Galaxy S9 (Clear) - 660543444121"
            }
        }
    ]
}

从上面的对象中，我需要在下面的数组中获取它。

identifierList = [ 'access8770009prd', 'access8530068prd', 'access8630012prd' ]

作为一维数组。任何人都可以提供一种有效的方法。

Answer 1

如果a是您拥有的json，则可以进行以下操作

identifierList = a.data.map(x => x.values.identifier)

Answer 2

您可以将 map（）与数组解构一起使用，以获取identifier的数组。

var data = [{
    "datatype": "AccessoryProduct",
    "values": {
      "identifier": "access8770009prd",
      "shortdescription": "<p>Hybrid Dual Injection Cover and a Tempered Glass.<\/p>",
      "displayname": "Protection Essentials Bundle - Samsung Galaxy S9 (Clear) 822445132623"
    }
  },
  {
    "datatype": "AccessoryProduct",
    "values": {
      "identifier": "access8530068prd",
      "shortdescription": "String.class",
      "displayname": "JBL UA Flex Headphones (Gray) - 050036342735"
    }
  }, {
    "datatype": "AccessoryProduct",
    "values": {
      "identifier": "access8630012prd",
      "shortdescription": "<p>This slim case has everything you want - style and protection.<\/p>",
      "displayname": "Otterbox Symmetry Series Case - Samsung Galaxy S9 (Clear) - 660543444121"
    }
  }
];
var identifierList = data.map(({values}) => values.identifier);
console.log(identifierList);

使用forEach（）

var data = [{
    "datatype": "AccessoryProduct",
    "values": {
      "identifier": "access8770009prd",
      "shortdescription": "<p>Hybrid Dual Injection Cover and a Tempered Glass.<\/p>",
      "displayname": "Protection Essentials Bundle - Samsung Galaxy S9 (Clear) 822445132623"
    }
  },
  {
    "datatype": "AccessoryProduct",
    "values": {
      "identifier": "access8530068prd",
      "shortdescription": "String.class",
      "displayname": "JBL UA Flex Headphones (Gray) - 050036342735"
    }
  }, {
    "datatype": "AccessoryProduct",
    "values": {
      "identifier": "access8630012prd",
      "shortdescription": "<p>This slim case has everything you want - style and protection.<\/p>",
      "displayname": "Otterbox Symmetry Series Case - Samsung Galaxy S9 (Clear) - 660543444121"
    }
  }
];
var identifierList = [];
data.forEach(({values}) => identifierList.push(values.identifier));
console.log(identifierList);