返回数据-----数组处理

//后台返回的数据
var dataArr = {
　　　　[{
            "id": 1799,
            "activity_name": "小彬彬啊啊啊",
            "group_num": 1,
            "group_member_num": 0
        }, {
            "id": 1800,
            "activity_name": "中华人民共和国测试部",
            "group_num": 1,
            "group_member_num": 0
        }, {
            "id": 1803,
            "activity_name": "慕容",
            "group_num": 1,
            "group_member_num": 0
        }, {
            "id": 1806,
            "activity_name": "姜致斌测试",
            "group_num": 1,
            "group_member_num": 0
        }, {
            "id": 1807,
            "activity_name": "姜大肥",
            "group_num": 1,
            "group_member_num": 0
        }]
    }
//转换

let ydata = [];
let xdata = [];

for (let i = 0; i < dataArr.length; i++) {
  ydata[i] = {
    name: dataArr[i].activity_name,
    value: dataArr[i].group_num
  };
  xdata[i] = dataArr[i].activity_name;
}

var dataTime = "20190713".replace(/^(\d{4})(\d{2})(\d{2})$/, "$1-$2-$3");
alert(dataTime);//2019-07-13

//日期处理
var time = "21090713"
var dataTime2 = time.toString().replace(/^(\d{4})(\d{2})(\d{2})$/, "$2-$3");
alert(dataTime2);//07-13