从 JSON 对象（Steam Api）获取特定数据

Question

所以我在练习一些 nodejs，这次我在玩 Steam api 和 json 对象。但是我遇到了一些问题。

所以，从 Steam api，

http://steamcommunity.com/profiles/<steamid>/inventory/json/730/2

我从这段代码中得到了 json，

var request = require('request');

var url = "http://steamcommunity.com/profiles/<steamid>/inventory/json/730/2"

request({
    url: url,
    json: true
}, function (error, response, body) {
     if (!error && response.statusCode === 200) {
        var json = JSON.parse(body);
        console.log(body) 
     }
});

json 看起来很精简，json-link

我想从json中取出每个项目的classid和instanceid，但是问题来了。我不知道怎么做。我知道我需要解析它，但不幸的是仅此而已。

如果有人可以解释如何，或链接指南/教程以便我学习，那将非常有帮助。

谢谢！

编辑：

    var request = require('request');
var _ = require('lodash');

var url = "http://steamcommunity.com/profiles/76561198007691048/inventory/json/730/2";


request({
    url: url,
    json: true
}, function jsonParse(error, response, data) {
    console.log(data.rgDescriptions);
    var item = getItems(data.rgDescriptions);
    console.log(item);

}

);

function getItems(data){
    var item = data;
    if(!item){
        return "error";

    }
    return _(item).keys().map(function(id){
        return _.pick([id], "name");}).value();

控制台给我这个； [ {}, {}, {}, {}, {}, {}, {}, {}, {},.... ]

JSON 看起来像这样；

'1293508920_0': 
   { appid: '730',
     classid: '1293508920',
     instanceid: '0',
     icon_url: '-9a81dlWLwJ2UUGcVs_nsVtzdOEdtWwKGZZLQHTxDZ7I56KU0Zwwo4NUX4oFJZEHLbXU5A1PIYQNqhpOSV-fRPasw8rsUFJ5KBFZv668FF4u1qubIW4Su4mzxYHbzqGtZ-KGlz8EuJcg3rnE9NiijVe3_UY-Zzr2JJjVLFEEeiQRtg',
     icon_drag_url: '',
     name: 'Shadow Case',
     market_hash_name: 'Shadow Case',
     market_name: 'Shadow Case',
     name_color: 'D2D2D2',
     background_color: '',
     type: 'Base Grade Container',
     tradable: 1,
     marketable: 1,
     commodity: 1,
     market_tradable_restriction: '7',
      },
  '1644880589_236997301': 
   { appid: '730',
     classid: '1644880589',
     instanceid: '236997301',
     icon_url: '-9a81dlWLwJ2UUGcVs_nsVtzdOEdtWwKGZZLQHTxDZ7I56KU0Zwwo4NUX4oFJZEHLbXU5A1PIYQNqhpOSV-fRPasw8rsUFJ4MAlVo6n3e1Y27OPafjBN09izq42ChfbzNvXTlGkD6p0lj7_FpNjx0VDj_UBoZ272cNfBdg48MAyB-VS3xum61Me_ot2XnqkB5QYc',
     icon_drag_url: '',
     name: 'MLG Columbus 2016 Mirage Souvenir Package',
     market_hash_name: 'MLG Columbus 2016 Mirage Souvenir Package',
     market_name: 'MLG Columbus 2016 Mirage Souvenir Package',
     name_color: 'D2D2D2',
     background_color: '',
     type: 'Base Grade Container',
     tradable: 1,
     marketable: 1,
     commodity: 0,
     market_tradable_restriction: '7',
      },

Answer 1

要处理复杂的对象或集合，您可以使用 lodash 库。

所以，你有以下格式的 json：

{
  "success":true,
  "rgInventory": {
    "5719625206": {"id":"5719625206","classid":"1651313004","instanceid":"188530139","amount":"1","pos":1},
    "5719034454": {"id":"5719034454","classid":"1649582636","instanceid":"188530139","amount":"1","pos":2},
    "5718628709": {"id":"5718628709","classid":"1649582636","instanceid":"188530139","amount":"1","pos":3},
    ...
  }
}

要提取所需项目的数组，首先在您的项目中安装 lodash 库：npm i -S，然后将此代码添加到您的文件中：

var _ = require('lodash');

function extractItems(data) {
  var rgInventory = _.get(data, 'rgInventory');
  if (!rgInventory) {
    return [];
  }
  return _(rgInventory)
    .keys()
    .map(function(id) {
      return _.pick(rgInventory[id], ['classid', 'instanceid']);
    })
    .value();
}