将两个嵌套的 json 对象与 javascript 结合起来，并用一个键循环遍历它

Question

我有几个 json 个对象（obj1、obj2...），每个对象都取自 .txt 文件：

{
  "countries": [
    {
      "Country name": "China",
      "Flag": "CN",
      "Population": 1395380000,
      "undefined": "#688144"
    }, ... ]}

和

{
  "countries": [
    {
      "Country name": "India",
      "Flag": "IN",
      "Population": 1338677000,
      "undefined": "#B78A31"
    }, ...]}

等等。 现在我想像这样组合它们：

{
  "countries": [
    {
      "Country name": "China",
      "Flag": "CN",
      "Population": 1395380000,
      "undefined": "#688144"
    },
 {
      "Country name": "India",
      "Flag": "IN",
      "Population": 1338677000,
      "undefined": "#B78A31"
    },
 ... ]}

所以我可以像这样遍历数据：

let obj1 = {}; //saved Data From Txt1;
let obj2 = {}; //saved Data From Txt2
...
let obj = combined?

for (var key in obj.countries) {
var num1 = obj.countries[key].Population+popholder;
if (target >= popholder && target <= num1) {
  var country = obj.countries[key]['Country name'];
  var testas = document.getElementById("countryname")
}}

我怎么能做到这一点？

Answer 1

只需连接 arrays：

 const obj1 = { "countries": [{ "Country name": "China", "Flag": "CN", "Population": 1395380000, "undefined": "#688144" } ] }; const obj2 = { "countries": [{ "Country name": "India", "Flag": "IN", "Population": 1338677000, "undefined": "#B78A31" } ] }; const result = { countries: [...obj1.countries, ...obj2.countries] }; console.log(result);

Answer 2

您可以使用创建具有相同countries地区属性的新 object 并使用Array#concat将所有国家/地区的 arrays 合并为一个：

 const obj1 = { "countries": [{ "Country name": "China", "Flag": "CN", "Population": 1395380000, "undefined": "#688144" }, /*... */ ] }; const obj2 = { "countries": [{ "Country name": "India", "Flag": "IN", "Population": 1338677000, "undefined": "#B78A31" }, /*... */ ] }; const obj3 = { "countries": [{ "Country name": "Sealand", "Flag": "", "Population": 27, "undefined": "#0000FF" }, /*... */ ] }; const combined = { countries: [].concat( obj1.countries, obj2.countries, obj3.countries ) }; console.log(combined);

如果你有一个对象数组，你可以结合Array#map和扩展语法来提取countries arrays 并将它们组合成一个：

 const obj1 = { "countries": [{ "Country name": "China", "Flag": "CN", "Population": 1395380000, "undefined": "#688144" }, /*... */ ]}; const obj2 = { "countries": [{ "Country name": "India", "Flag": "IN", "Population": 1338677000, "undefined": "#B78A31" }, /*... */ ]}; const obj3 = { "countries": [{ "Country name": "Sealand", "Flag": "", "Population": 27, "undefined": "#0000FF" }, /*... */ ]}; const objArr = [obj1, obj2, obj3]; const combined = { combined: [].concat(...objArr.map(x => x.countries) ) }; console.log(combined)

Answer 3

您可以push所有 arrays 合二为一。

 const obj1 = { "countries": [ { "Country name": "China", "Flag": "CN", "Population": 1395380000, "undefined": "#688144" }, ]} const obj2 = { "countries": [ { "Country name": "India", "Flag": "IN", "Population": 1338677000, "undefined": "#B78A31" },]}; const res = [obj1, obj2, /*...*/].reduce((acc,{countries})=>(acc.countries.push(...countries),acc), {countries: []}); console.log(res);