javascript - 如何将 JSON 字符串对象值转换为整数？

Question

我正在尝试将 JSON 对象值转换为整数并进行计算。

它很好地显示了 representativeRow.DTA_VAL，但是 total 的值显示了 NaN。

我认为这行不通，因为其他代码运行良好。

  datav=  Number(representativeRow.DTA_VAL);

这是我的代码

  var rows = resp.Sttsapitbldata[1].row;
        if (rows) {
            var representativeRow;
            for (i = 1; i < 30; i++) {
                representativeRow = rows[i];

                if(representativeRow.ITM_NM.substring(0,2)=="부산"){
                   // console.log(representativeRow.ITM_NM);
                    var sub =representativeRow.ITM_NM.substring(0,3);
                    var total;
                    var datav;
                    console.log(representativeRow.DTA_VAL);
                    datav=  Number(representativeRow.DTA_VAL);

                    total+=datav;
                    console.log(total);

                }

                itemNm2 = representativeRow.ITM_NM;
                dataV = representativeRow.DTA_VAL;
                //console.log(itemNm2);
                //console.log(dataV);
                options.data.data.push({locname: itemNm2, listshrs: dataV});
            }


            korea = webponent.visual.korea.init($(".korea"), style, options);

        }

请参阅下面的 JSON 文件代码。

{"Sttsapitbldata":[{"head":[{"list_total_count":88},{"RESULT":{"CODE":"INFO-000","MESSAGE":"정상 처리되었습니다."}}]},{"row":[{"STATBL_ID":"T183673021266818","DTACYCLE_CD":"YY","WRTTIME_IDTFR_ID":"2016","ITM_ID":10001,"ITM_NM":"계","CLS_ID":50033,"CLS_NM":"강간","UI_NM":"명","DTA_VAL":5155,"DTA_SVAL":null},{"STATBL_ID":"T183673021266818","DTACYCLE_CD":"YY","WRTTIME_IDTFR_ID":"2016","ITM_ID":10002,"ITM_NM":"서울","CLS_ID":50033,"CLS_NM":"강간","UI_NM":"명","DTA_VAL":1129,"DTA_SVAL":null},{"STATBL_ID":"T183673021266818","DTACYCLE_CD":"YY","WRTTIME_IDTFR_ID":"2016","ITM_ID":10003,"ITM_NM":"부산","CLS_ID":50033,"CLS_NM":"강간","UI_NM":"명","DTA_VAL":314,"DTA_SVAL":null},

Answer 1

您应该初始化 total=0。您不能在第一次迭代时添加到空值。虽然看着它，但我怀疑你想要在循环之外初始化 total