如何根据JavaScript数组对象的null键值操作它

我的数据如下：

let activityList = [
{
"2-createdAt": "2019-12-27T13:11:04.300+0000",
"2-modifiedAt": "2020-01-02T13:28:18.877+0000",
"2-createdBy": "admin_tna",
"2-lastModifiedBy": "admin_tna",
"2-id": 2,
"2-name": "Activity 2",
"2-serialNo": 543,
"2-notify": "No",
"2-department": {createdAt: "2019-12-26T12:26:37.752+0000", modifiedAt: "2019-12-26T12:26:37.752+0000", createdBy: "admin_tna", lastModifiedBy: "admin_tna", id: 2,},
"2-subActivityList": [{}],
"2-departmentId": 2,
"2-cLevel": "false",
"20-createdAt": "2020-01-09T08:44:19.697+0000",
"20-modifiedAt": "2020-01-09T08:44:19.697+0000",
"20-createdBy": "admin_tna",
"20-lastModifiedBy": "admin_tna",
"20-id": 20,
"20-name": "Activity 3",
"20-serialNo": 8,
"20-notify": null,
"20-department": {createdAt: "2019-12-26T12:03:09.485+0000", modifiedAt: "2019-12-26T12:26:14.402+0000", createdBy: "admin_tna", lastModifiedBy: "admin_tna", id: 1,},
"20-subActivityList": (3) [{}, {}, {}],
"20-departmentId": 1,
"20-cLevel": true,
"21-createdAt": "2020-01-09T08:48:16.282+0000",
"21-modifiedAt": "2020-01-09T08:48:16.282+0000",
"21-createdBy": "admin_tna",
"21-lastModifiedBy": "admin_tna",
"21-id": 21,
"21-name": "Activity 1",
"21-serialNo": 8,
"21-notify": null,
"21-department": {createdAt: "2019-12-26T12:26:37.752+0000", modifiedAt: "2019-12-26T12:26:37.752+0000", createdBy: "admin_tna", lastModifiedBy: "admin_tna", id: 2,},
"21-subActivityList": (2),
"21-departmentId": 2,
"21-cLevel": true,
"buyerId": 2,
"name": "ss",
"tnaType": "Forward",
"2-leadTimeNormal": 8,
"2-leadTimeOptimal": 4,
"2-timeFrom": "O"}
]

如您所见，我只有

ID2

的

leadTimeNormal

和

leadTimeOptimal

数据，读作

2-leadTimeNormal:8，2-leadTimeOptimal:4，

所以，我想要一个新的对象列表，如下所示：

let newActivity = [{
        "2-createdAt": "2019-12-27T13:11:04.300+0000",
        "2-modifiedAt": "2020-01-02T13:28:18.877+0000",
        "2-createdBy": "admin_tna",
        "2-lastModifiedBy": "admin_tna",
        "2-id": 2,
        "2-name": "Activity 2",
        "2-serialNo": 543,
        "2-notify": "No",
        "2-department": {createdAt: "2019-12-26T12:26:37.752+0000", modifiedAt: "2019-12-26T12:26:37.752+0000", createdBy: "admin_tna", lastModifiedBy: "admin_tna", id: 2,},
        "2-subActivityList": [{}],
        "2-departmentId": 2,
        "2-cLevel": "false",
    "2-leadTimeNormal": 8,
        "2-leadTimeOptimal": 4,
        "2-timeFrom": "O"
    }]

---

这可能会缩短，但这只是一个开始

let activityList=[{“2-createdBy”：“2019-12-27T13:11:04.300+0000”，“2-modifiedAt”：“2020-01-02T13:28:18.877+0000”，“2-createdBy”：“admin_tna”，“2-lastModifiedBy”：“admin_tna”，“2-id”：2，“2-name”：“Activity 2”，“2-serialNo”：543，“2-notify”：“No”，“2-department”：{createdAt:“2019-12-26T12:26:37.752+0000”，modifiedAt:“2019-12-26T12:26:37.752+0000”，由“管理员”创建，最后修改为：“管理员”，id:2，}，“2-subActivityList:[{}]，“2-departmentId”：2，“2-cLevel:“false”，“20-createdAt:“2020-01-09T08:44:19.697+0000”，“20-createdAt:“2020-01-09T08:44:19.697+0000”，“20-createdBy:“管理员”；“管理员”；“20-createdBy:“管理员”；“姓名”，“20-id:”活动3，“20 serialNo”：8，“20 notify”：null，“20 department:{createdAt:“2019-12-26T12:03:09.485+0000”，modifieddat:“2019-12-26T12:26:14.402+0000”，createdBy:“admin_tna”，lastModifiedBy:“admin_tna”，id:1，}，“20 subActivityList:”：（3），“20 departmentId:“1，”20 cLevel:“true，”21 createdAt:“2020-01-T08:48:282+0000”21修改：“2020-01-09T08:48:16.282+0000”，“21创建人”：“管理人”，“21最后修改人”：“管理人”，“21 id”：21，“21姓名”：“活动1”，“21序列号”：8，“21通知”：空，“21部门”：{创建人：“2019-12-26T12:26:37.752+0000”，修改人：“2019-12-26T12:26:37.752+0000”，创建人：“管理人”，最后修改人：“管理人”“，id:2，}，“21子活动列表”：（2），“21部门id:2，”21 cLevel:true，“buyerId:2，”name:“ss”，“tnaType:“转发”，“2-leadTimeNormal”：8，“2-leadTimeOptimal”：4，“2-timeFrom:“O”}]
const keys=Object.keys（activityList[0]）；
const matches=JSON.stringify（keys.matchAll（/“（\d+-）提前期/g）；
前缀=[]；
for（连续匹配）{
if（prefix.indexOf（匹配[1]）==-1）prefix.push（匹配[1]）
}  
const newObject={}
keys.forEach（k=>{
if（前缀.indexOf（k.split（“-”[0]+“-”）==0）newObject[k]=activityList[0][k]
})
console.log（newObject）