用于循环输出的Node.js仅来自JSON的最后一项

Question

下面的代码只输出最后一个结果，我不明白。我检查updateDate条目是否包含2020-05，两个条目都包含，并且我只得到最后一个条目。循环没有循环:)

const briefing = [
        {
          "updateDate": "2020-05-05T00:00:00.0Z",
        },
        {
          "updateDate": "2020-05-06T00:00:00.0Z",
         },
         {
         "updateDate": "2020-05-13T00:00:00.0Z",
        }
        ];

       let date = new Date();
        var formattedYearMonth = date.getFullYear() + '-' + ('0' + (date.getMonth()+1)).slice(-2) + '-';

        for (var i = 0; i < briefing.length; i++) {
            var jsonDate = briefing[i].updateDate;
            if (jsonDate.includes(formattedYearMonth)) {
            var response = JSON.stringify(briefing[i]);
            }
        }return response;
}

Answer 1

for (var i = 0; i < briefing.length; i++) {
            var jsonDate = briefing[i].updateDate;
            if (jsonDate.includes(formattedYearMonth)) {
               var response = JSON.stringify(briefing[i]); // <==== THIS IS WHERE YOUR PROBLEM LIES
            }
        }return response;

循环实际上是循环:)。但是，对于循环的每一次运行，您都会重置response的值。

--编辑--

要使响应成为数组，您需要将代码修改为

let response = [];
for (var i = 0; i < briefing.length; i++) {
    var jsonDate = briefing[i].updateDate;
    if (jsonDate.includes(formattedYearMonth)) {
        response.push(JSON.stringify(briefing[i])); 
    }
}
return response;