js将数组对象中，以某个值相同的对象合并成一个；即把某个值相同的对象内容合并成一个

以下列数据为例，总共有13条数据， 把label相同的数据，里面的children合并成一个             代码在最后

 1、初始化数据

2.结果

3.代码

      let testArr = [
        {
          label: "考区/考点",
          prop: "deptNames",
          row: true,
          search: true,
           200,
          editDisabled: true,
          expand: true,
          hide: true,
          defaultExpandAll: false,
          type: "tree",
          dicUrl: "/test/boltdept/getAreaAndPointTree",
          props: {
            label: "deptName",
            value: "deptId",
            children: "children",
          },
        },
        {
          label: "机构",
          prop: "deptName",
          type: "select",
          row: true,
          editDisplay: false,
          search: false,
          dicUrl: "/test/dict/getDictsByCode?dictCode=kw_tag_type",
          props: {
            label: "dictValue",
            value: "dictKey",
          },
        },
        {
          label: "单位等级",
          prop: "deptLeve",
          editDisplay: false,
          search: true,
          hide: true,
          row: true,
          span: 15,
          type: "select",
          dicQuery: {
            materialDictType: 0,
          },
          dicUrl: "/test/materialdictsetting/selectViewLevelList",
          props: {
            label: "dictValue",
            value: "dictKey",
          },
        },
        {
          label: "机构等级",
          row: true,
          search: false,
          editDisabled: true,
           200,
          type: "select",
          prop: "deptLevel",
          dicUrl: "/test/dict/getDictsByCode?dictCode=kw_dept_level",
          props: {
            label: "dictValue",
            value: "dictKey",
          },
        },
        {
          label: "语文",
          prop: "203311500001",
          row: true,
          children: [
            {
              label: "备用卷",
              prop: "203311500001_85975601163943937",
            },
          ],
        },
        {
          label: "数学",
          prop: "203311500002",
          row: true,
          children: [
            {
              label: "备用卷",
              prop: "203311500002_85975601163943937",
            },
          ],
        },
        {
          label: "数学",
          prop: "203311500002",
          row: true,
          children: [
            {
              label: "test_3",
              prop: "203311500002_84857933463703554",
            },
          ],
        },
        {
          label: "英语",
          prop: "203311500004",
          row: true,
          children: [
            {
              label: "备用卷",
              prop: "203311500004_85975601163943937",
            },
          ],
        },
        {
          label: "英语",
          prop: "203311500004",
          row: true,
          children: [
            {
              label: "test_3",
              prop: "203311500004_84857933463703554",
            },
          ],
        },
        {
          label: "印刷材料",
          prop: null,
          row: true,
          children: [
            {
              label: "cs",
              prop: "84563743102074881",
            },
          ],
        },
        {
          label: "印刷材料",
          prop: null,
          row: true,
          children: [
            {
              label: "test_1",
              prop: "84507262931640321",
            },
          ],
        },
        {
          label: "印刷材料",
          prop: null,
          row: true,
          children: [
            {
              label: "测试啊",
              prop: "84172603177795585",
            },
          ],
        },
        {
          label: "印刷材料",
          prop: null,
          row: true,
          children: [
            {
              label: "test",
              prop: "84173239118168066",
            },
          ],
        },
      ];
      console.log(testArr);

      function mergeArr(testArr) {
        var tempArr = [];
        var afterData = [];
        for (let i = 0; i < testArr.length; i++) {
          if (tempArr.indexOf(testArr[i].label) === -1) {
            afterData.push({
              label: testArr[i].label,
              children: [testArr[i]],
              prop: testArr[i].prop,
            });
            tempArr.push(testArr[i].label);
          } else {
            for (let j = 0; j < afterData.length; j++) {
              if (
                (afterData[j].label == testArr[i].label) &
                testArr[i].hasOwnProperty("children")
              ) {
                afterData[j].children.push(testArr[i]);
                break;
              }
            }
          }
        }
        console.log(afterData, "初次结果");

        afterData.forEach((item) => {
          item.childrenOne = [];
          item.children.forEach((y) => {
            //   console.log(y, "----", y.children);
            if (y.children != undefined) {
              item.childrenOne.push(y.children[0]);
            }
          });
        });

        let jj = afterData;
        jj.forEach((item, index) => {
          item.children = [];
          item.children = item.childrenOne;
          delete jj[index].childrenOne;
          if (jj[index].children.length == 0) {
            delete jj[index].children;
          }
        });

        console.log(jj);
        return jj
      }

      console.log(this.mergeArr(testArr), "---最终结果");