如何使用javascript并基于提供的输入获取JSON数据？

如何使用javascript并基于提供的输入获取JSON数据

我的JSON文件如下所示

{
    "Name1": {
        "id": "32313",
        "latitude": "57.1",
        "longitude": "9.85",
        "timezone": "2",
        "city": "Aalborg",
        "country": "Denmark",
        "country_code": "DK"
    },
    "Name2": {
        "id": "32314",
        "latitude": "56.15",
        "longitude": "10.2167",
        "timezone": "2",
        "city": "Aarhus",
        "country": "Denmark",
        "country_code": "DK"
    },
    "Name3": {
        "id": "122109",
        "airport_name": "Aasiaat",
        "latitude": "68.7",
        "longitude": "-52.75",
        "timezone": "-3",
        "city": "Aasiaat",
        "country": "Greenland",
        "country_code": "GL"
    },
    "Name4": {
        "id": "116713",
        "latitude": "30.371111",
        "longitude": "48.228333",
        "timezone": "4",
        "city": "Abadan",
        "country": "Iran",
        "country_code": "IR"
    },
    "Name5": {
        "id": "116711",
        "latitude": "53.74",
        "longitude": "91.385",
        "timezone": "7",
        "city": "Abakan",
        "country": "Russia",
        "country_code": "RU"
    },
    "Name6": {
        "id": "120587",
        "latitude": "49.05",
        "longitude": "-122.2833",
        "timezone": "-7",
        "city": "Abbotsford",
        "country": "Canada",
        "country_code": "CA"
    },
    "Name7": {
        "id": "116759",
        "latitude": "13.847",
        "longitude": "20.844333",
        "timezone": "1",
        "city": "Abeche",
        "country": "Chad",
        "country_code": "TD"
    },
    "Name8": {
        "id": "32325",
        "latitude": "57.2",
        "longitude": "-2.2",
        "timezone": "1",
        "city": "Aberdeen",
        "country": "United Kingdom",
        "country_code": "GB"
    }
}

从上面的JSON文件。。。我需要得到以下信息：

获取国家列表

根据提供的国家名称获取城市名称

请帮我解析上面的JSON文件

谢谢， 尤甘达尔

​

underline.js（）是javascript库的瑞士军刀，在处理类似本例的数据集时非常有用

我创建了一个JSFIDLE来解决您的两个用例

以下是重要部分：

function getCityData(country) {
    return _(data)
        .filter(function(el) {
            return el.country === country;
        });           
}

function getCountries() {
    return _(data).chain().pluck("country").uniq().value();
}

---

如何根据国家或城市名称获取关键名称。。。例如：getKeyName（Country）应该像那样返回“Name1/Name2/”。您不需要使用国家代码作为键，除非您愿意，否则您可以将城市[国家代码]替换为城市[国家]。如果您确实想使用country_代码作为键，只需添加另一个名为var country_code=[]的全局变量，然后添加country_code.push（country_code）；你好我想我的问题提得不好。。。当我提供的相应国家/地区代码。。。如果我说Country_Code=“GB”，那么我的返回值=“Name8”…啊，对不起，我误解了，我用一个keyNames对象更新了我的代码嘿@YugandharKumar刚刚跟进，keyNames对象对你有用吗？

var countries = [];
// Vanilla Javascript
// Get Array of countries
for( var name in json ){
  countries.push(json[name]["country"]);
}
// Get city name based on country name

var getCities =  function(country){
  var cities = [];
  for( var name in json ){
    if (country === json[name]["country"]){
      cities.push(name);
    }
  }
  return cities;
}

// Usage
var cities = getCities("Denmark"); //

function getCityData(country) {
    return _(data)
        .filter(function(el) {
            return el.country === country;
        });           
}

function getCountries() {
    return _(data).chain().pluck("country").uniq().value();
}