根据数据合并单元格

   columns: [
           {
              title: "号码",
              dataIndex: "projectCode",
              width: 100,
              customRender: (text, row, index) => {
                const obj = {
                  children: text !== null ? text : "",
                  attrs: {
                    rowSpan: 1,
                  },
                };
                obj.attrs.rowSpan = this.renderCells(text, row, index);
                rowSpans = obj.attrs.rowSpan;
                rowhj = text;
                return obj;
              },
            },
//根据这个单独的字段为准 合并


rowhj  //提取为全局

  renderCells(text, row, index) {
      const beforeinx = this.list.findIndex(
        (item) => item.projectCode === row.projectCode
      );

      if (beforeinx < index) {
        return 0;
      }
      if (beforeinx === index) {
        return this.list.filter((item) => item.projectCode === row.projectCode)
          .length;
      }
      return 1;
    },
//合并的方法

//其他根据projectCode 去合并

        {
                  title: "来源名称", //未改
                  dataIndex: "mcCode2",
                  width: i,
                  customRender: (text, row, index) => {
                    const obj = {
                      children: text !== null ? text : "",
                      attrs: {
                        rowSpan: rowSpans,
                      },
                    };
                    return obj;
                  },
                },