勾选element外层表格某行数据时，该行数据下嵌套的内层表格数据自动全选

Question

急急急！！！求教诸位大神，如何勾选element外层表格某行数据时，该行数据下嵌套的内层表格数据自动全部选中。

        <el-table
                :data="tableData"
                border
                element-loading-text="Loading"
                default-expand-all
                @selection-change="handleSelectionChange"
                style="width: 100%">
            <el-table-column
                    type="selection"
                    width="55">
            </el-table-column>
            <el-table-column
                    prop="Name"
                    label="物资名称">
            </el-table-column>
            <el-table-column
                    prop="num"
                    label="批次">
            </el-table-column>
            <el-table-column
                    prop="user"
                    label="责任人">
            </el-table-column>
            <el-table-column type="expand">
                <template slot-scope="props">
                    <div class="table_inner">
                        <el-table
                                :data="props.row.detail"
                                ref="multipleTableSecond"
                                style="width: 100%">
                            <el-table-column
                                    type="selection"
                                    width="55">
                            </el-table-column>
                            <el-table-column label="cuu成分" prop="cuu">

                            </el-table-column>
                            <el-table-column
                                    prop="week"
                                    label="周期">
                            </el-table-column>
                            <el-table-column
                                    label="是否补充"
                                    prop="isadd">
                            </el-table-column>
                        </el-table>
                    </div>
                </template>
            </el-table-column>
        </el-table>
        
      data中：
      
      return {
            tableData: [
                {
                    Name:'量粒',
                    num:'第一批',
                    user:'杜强',
                    detail:[
                        {
                            cuu:'CUUT-1',
                            week:1,
                            isadd:'是',
                        },
                        {
                            cuu:'CUUT-2',
                            week:2,
                            isadd:'否',
                        }
                    ]
                },

            ],
            multipleTableSecond: [],
            multipleTable: [],
        }

Answer 1

老哥，你那个嵌套表格的全选是怎么实现的?在线等，急！