javascript - 返回 javascript 对象的特定值

Question

我有一个脚本将其返回为“r2”:

{
    waitSeconds: 0,
    runSeconds: 0,
    report: {
        data: [{
            breakdown: [{}],
            breakdownTotal: ["608674"],
            day: 1,
            month: 10,
            name: "Mon.  1 Oct. 2018",
            year: 2018,
        }, {
            name: "Tue.  2 Oct. 2018",
            year: 2018,
            month: 10,
            day: 2,
            breakdown: [{}],
            breakdownTotal: ["123456"]
        }, {
            name: "Wed.  3 Oct. 2018",
            year: 2018,
            month: 10,
            day: 3,
            breakdown: [{}],
            breakdownTotal: ["123456"]
        }, {
            name: "Thu.  4 Oct. 2018",
            year: 2018,
            month: 10,
            day: 4,
            breakdown: [{}],
            breakdownTotal: ["123456"]
        }, ],
        elements: [{}],
        metrics: [{}],
    }
}

我正在 try catch 两件事并以以下格式返回它们:

[X,Y,Z,ETC]

我已经能够使用这段代码捕获这一天:

const days = r2.report.data.map(obj => obj.day);

但是，当我尝试获取 breakdownTotal(即 608674)时

const metric = r2.report.data.map(obj => obj.breakdownTotal);

它返回这个:

[Array(1), Array(1), Array(1), Array(1)]

如何让它返回 breakdownTotal 值？

Answer 1

您想要分割数组的第一个值而不是数组本身，对吗？

const metric = r2.report.data.map(obj => obj.breakdownTotal[0]);

试试这个？