我有幾個(gè) json 對(duì)象（obj1、obj2...），每個(gè)對(duì)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?，F(xiàn)在我想像這樣組合它們：{  "countries": [    {      "Country name": "China",      "Flag": "CN",      "Population": 1395380000,      "undefined": "#688144"    }, {      "Country name": "India",      "Flag": "IN",      "Population": 1338677000,      "undefined": "#B78A31"    }, ... ]}所以我可以像這樣遍歷數(shù)據(jù)：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")}}我怎么能做到這一點(diǎn)？