javascript - 使用 JS 从嵌套 JSON 中提取值到数组

Question

我有一个带有嵌套对象的 JSON 文件，我需要从每个对象中提取特定键的值并保存到数组中。无需保留结构或顺序。

请参阅下面的 JSON。我需要提取'text'键的值并得到这样的结果数组 ["CPUs", "AMD", "Ryzen", "intel",....]

实现这一目标的最佳方法是什么？

[
   {
      "itemID":"1",
      "items":[
         {
            "itemID":"2",
            "items":[
               {
                  "itemID":"3",
                  "items":[
                     {
                        "itemID":"15",
                        "text":"Ryzen"
                     },
                     {
                        "itemID":"16",
                        "text":"Threadripper"
                     }
                  ],
                  "text":"AMD",
               },
               {
                  "itemID":"66",
                  "items":[
                     {
                        "itemID":"76",
                        "text":"i5"
                     },
                     {
                        "itemID":"77",
                        "text":"i7"
                     },
                     {
                        "itemID":"78",
                        "text":"i3"
                     }
                  ],
                  "text":"Intel"
               },
               {
                  "itemID":"70",
                  "text":"Apple"
               }
            ],
            "text":"CPUs"
         }
      ],
      "text":"computer parts"
   },
   {
      "itemID":"4",
      "items":[
         {
            "itemID":"5",
            "items":[
               {
                  "itemID":"21",
                  "text":"porsche"
               },
               {
                  "itemID":"22",
                  "text":"maserati"
               },
               {
                  "itemID":"23",
                  "text":"ferrari"
               }
            ],
            "text":"sports cars"
         }
      ],
      "text":"cars"
   }
]

标签： javascriptjsonjavascript-objects

Answer 1

简单的递归应该有助于遍历数组以获取具有该text属性的对象

const data = [{"itemID":"1","items":[{"itemID":"2","items":[{"itemID":"3","items":[{"itemID":"15","text":"Ryzen"},{"itemID":"16","text":"Threadripper"}],"text":"AMD"},{"itemID":"66","items":[{"itemID":"76","text":"i5"},{"itemID":"77","text":"i7"},{"itemID":"78","text":"i3"}],"text":"Intel"},{"itemID":"70","text":"Apple"}],"text":"CPUs"}],"text":"computer parts"},{"itemID":"4","items":[{"itemID":"5","items":[{"itemID":"21","text":"porsche"},{"itemID":"22","text":"maserati"},{"itemID":"23","text":"ferrari"}],"text":"sports cars"}],"text":"cars"}];

function getText(item) {
  let result = [];

  if (item.text) result.push(item.text);
  for (const key in item) {
    if (item.hasOwnProperty(key) && typeof item == 'object') result.push(...getText(item[key]));
  }

  return result;
}

data.forEach(item => console.log(getText(item)));