JS按照特定的条件对数组进行归类

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原创最新推荐文章于 2026-08-01 11:16:52 发布 3.1k 阅读 AI 写同款· GEO 优化 ›

js实现对象数组内依据键值自定义计算---主键去重+指定属性求和 js实现对象数组内依据键值自定义求和计算考虑这样的业务背景: 通过接口获取某公司当月所有员工的每日考勤数据如下, [ {id:1,score:2,date:"2019.06.19"} ,{id:1,score:5,date:"2019.06.20"} ,{id:1,score:7.6,date:"2019.06.21"} ,{id:1,score:3,date:"2019.06.22"} ,{i... 阅读详情

函数定义：

function groupBy(arr, prop, callback) {

            var newArr = [],
                tempArr = [];
            for (var i = 0, j = arr.length; i < j; i++) {

                var result = callback(arr[i], arr[i + 1], prop);

                if (result) {

                    tempArr.push(arr[i]);

                } else {
                    tempArr.push(arr[i]);
                    newArr.push(tempArr.slice(0));
                    tempArr.length = 0;
                }

            }

            return newArr;
        }

测试数据:

var dates = [{
            created_at: "2017-10-23 12:00:00"
        }, {
            created_at: "2017-10-23 13:00:00"
        }, {
            created_at: "2017-10-23 14:00:00"
        }, {
            created_at: "2017-10-24 12:00:00"
        }, {
            created_at: "2017-10-22 12:00:00"
        }, {
            created_at: "2017-10-22 12:00:00"
        }, {
            created_at: "2017-10-25 12:00:00"
        }, {
            created_at: "2017-10-28 12:00:00"
        }, {
            created_at: "2017-10-28 11:00:00"
        }]

函数调用:

var result = groupBy(dates, 'created_at', (a, b, key) => {

            var C1 = a[key].split(' ')[0];
            var C2 = null;
            try {
                C2 = b[key].split(' ')[0];
            } catch (exception) {
                C2 = null;
            }

            return C1 == C2;
        });

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