element 表格多选框 记忆选择 组件的相关代码

<el-table
            ref="multipleTable"
            :data="tableData"
            :header-cell-style="tableHeaderColor"
            border
            :row-key="getRowKeys"
            style="width: 100%"
            @selection-change="handleSelectionChange"
          >
            <el-table-column
              type="selection"
              width="55"
              :reserve-selection="true"
            >
            </el-table-column>
            <el-table-column label="产品名称" prop="PD_NAME"> </el-table-column>
            <el-table-column prop="DEVICE_MODE_NAME" label="型号">
            </el-table-column>
            <el-table-column prop="DEVICE_TYPE_NAME" label="产品类型">
            </el-table-column>
          </el-table>
reserve-selection : 储备选择  
仅对 type=selection 的列有效，类型为 Boolean，为 true 则会在数据更新之后保留之前选中的数据（需指定 row-key）
getRowKeys(row: any) {
    return row.ID;
  }
  public handleSelectionChange(name: any): void {
    this.selname = name;
  }