element 合并表格

objectSpanMethod({ row, column, rowIndex, columnIndex }) {
      //  console.log(row)
      //  console.log(column)
      //  console.log(rowIndex)
      //  console.log(columnIndex)

//0 代表表格的第一项
      if ([0].includes(columnIndex)) {
        let rowspan = this.cell[rowIndex];
        let colspan = rowspan > 0 ? 1 : 0;
        return { rowspan, colspan };
      }
    },
    // 合并单元格
    mergeCell(datas) {
      // console.log(datas)
      let list = [],
        index = 0;
      for (let i = 0; i < datas.length; i++) {
        list[i];
        if (!i) {
          index = 0;
          list.push(1);
        } else {
          // title  自己更换唯一的值
          if (datas[i].spec_value[0].id == datas[i - 1].spec_value[0].id) {
            list[index] += 1;
            list.push(0);
          } else {
            list.push(1);
            index = i;
          }
        }
      }

      this.cell = list;
    },

  <el-table
              :data="tableData"
              border
              style="width:1110px;"
              :span-method="objectSpanMethod"
            >
              <el-table-column
                align="center"
                :key="col.prop"
                :label="col.name"
                :prop="String(col.prop)"
                v-for="col in cols"
              >
              </el-table-column>
              <el-table-column
                label="状态"
                v-if="tableData.length > 0"
                width="100"
                align="center"
              >
                <template slot-scope="scope">
                  {{ scope.row.is_online == 2 ? "启用" : "禁用" }}
                </template>
              </el-table-column>
              <el-table-column
                label="操作"
                v-if="tableData.length > 0"
                width="200"
                align="center"
              >
                <template slot-scope="scope">
                  <el-button
                    @click="editAttr(scope.row)"
                    size="mini"
                    type="text"
                  >
                    属性设置
                  </el-button>
                  <el-button
                    @click="editImg(scope.row)"
                    size="mini"
                    type="text"
                  >
                    图组设置
                  </el-button>
                  <el-button
                    @click="editStatus(scope.row)"
                    size="mini"
                    type="text"
                  >
                    {{ scope.row.is_online == 2 ? "禁用" : "启用" }}
                  </el-button>
                </template>
              </el-table-column>
            </el-table>

            that.mergeCell(that.tableData);