js里JSON数据分组

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function GroupBy(arr,key) {         var obj = {};         for (let i = 0; i <arr.length; i++) {             if (obj[arr[i][key]]) {                 obj[arr[i][key]].push(arr[i]);             } else {                 obj[arr[i][key]] = new Array();                 obj[arr[i][key]].push(arr[i]);             }         }         return obj;     }

　　

例如:

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var data=[{     "ID": "1",     "Name": "张三",     "Gender": "男",     "Birthday": "2020-03-24 00:00:00" }, {     "ID": "2",     "Name": "李四",     "Gender": "男",     "Birthday": "2020-03-23 00:00:00" }, {     "ID": "3",     "Name": "王五",     "Gender": "男",     "Birthday": "2020-03-20 00:00:00" }, {     "ID": "4",     "Name": "赵六",     "Gender": "男",     "Birthday": "2020-03-28 00:00:00" }, {     "ID": "5",     "Name": "田七",     "Gender": "女",     "Birthday": "2020-03-25 00:00:00" }]; console.log(GroupBy(data,"Gender")) //输出{男: Array(4), 女: Array(1)}