如何做到表头也不分列呀 elment(关键词-二维)

如何做到表头也不分列呀 elment

<el-table-column width="230" :show-overflow-tooltip="true">
          <el-table-column>
            <template slot-scope="{ row }" >
              {{ row.rfid }}
            </template>
          </el-table-column>
          <el-table-column>
            <template slot-scope="{ row }" >
              {{ row.uniqueIdentification }}
            </template>
          </el-table-column>

          <template slot="header">
            RFID码/二维码
            <el-tooltip placement="top">
              <div slot="content">板卡条/二维码</div>
              <i class="el-icon-question"></i>
            </el-tooltip>
          </template>
      </el-table-column>

如何把图片中红色框内去掉

合并单元格

colspan = "2"
rowspan="2"

<el-table-column width="230" :show-overflow-tooltip="true" colspan = "2" rowspan="2">
</el-table-column>