js 如何把salary数组中 postDate 是相同月份的 amountMoney相加 返回新的

Question

{"salary": [{  "postDate": "2017-09-29 00:00:00",  "amountMoney": "495.0"},{  "postDate": "2017-09-13 00:00:00",  "amountMoney": "495.0"},{  "postDate": "2017-09-04 00:00:00",  "amountMoney": "2526.06"},{  "postDate": "2017-08-08 00:00:00",  "amountMoney": "495.0"},{  "postDate": "2017-08-08 00:00:00",  "amountMoney": "2526.06"},{  "postDate": "2017-07-24 00:00:00",  "amountMoney": "495.0"},{  "postDate": "2017-07-19 00:00:00",  "amountMoney": "2526.06"},{  "postDate": "2017-06-16 00:00:00",  "amountMoney": "2772.06"}]}

Answer 1

var salary = [

    {

      "postDate": "2017-09-29 00:00:00",

      "amountMoney": "495.0"

    },

    {

      "postDate": "2017-09-13 00:00:00",

      "amountMoney": "495.0"

    },

    {

      "postDate": "2017-09-04 00:00:00",

      "amountMoney": "2526.06"

    },

    {

      "postDate": "2017-08-08 00:00:00",

      "amountMoney": "495.0"

    },

    {

      "postDate": "2017-08-08 00:00:00",

      "amountMoney": "2526.06"

    },

    {

      "postDate": "2017-07-24 00:00:00",

      "amountMoney": "495.0"

    },

    {

      "postDate": "2017-07-19 00:00:00",

      "amountMoney": "2526.06"

    },

    {

      "postDate": "2017-06-16 00:00:00",

      "amountMoney": "2772.06"

    }

];

var rs = [];

var json = {};

for (let i = 0, len = salary.length; i < len; i++) {

    var month = salary[i].postDate.split('-')[1];

    if (json[month] !== 1) {

        rs.push ({

            month: month,

            amountMoney: Number(salary[i].amountMoney)

        })

        json[month] = 1;

    } else {

        for (let j = 0, l = rs.length; j < l; j++) {

            if (rs[j].month == month) {

                rs[j].amountMoney += Number(salary[i].amountMoney)

            }

        }

    }

}

console.log(rs);

Answer 2

array.map()

Answer 3

主要是不知道怎么把 月份数相同的amountMoney相加 也就是map()里面的内容。。

Answer 4

把postDate参数转换为 时间戳 进行相等匹配 再返回新数组