一、效果图

二、使用场景

🛀el-form 表单内嵌套el-table表格
🛀el-table 表格内又嵌套el-table表格

三、所用组件元素（Elementui）

🍣 合并行或列

多行或多列共用一个数据时，可以合并行或列。

🍣 表尾合计行(根据具体需求决定使用)

若表格展示的是各类数字，可以在表尾显示各列的合计。

四、代码部分

<el-form :model="ruleForm" :rules="rules" ref="ruleForm" :label-width="'auto'">
	<el-table v-show="ruleForm.visitType === 2 && ruleForm.visitingDetailDTOS && ruleForm.visitingDetailDTOS.length" :data="ruleForm.visitingDetailDTOS" :span-method="arraySpanMethod" style="width: 90%" tooltip-effect="light">
        <el-table-column prop="date" label="来访日期" width="130px"></el-table-column>
        <el-table-column prop="time" label="来访时间段" min-width="160">
            <template v-slot="{row, $index: index}">
                <el-table v-if="row.visitingReqList && row.visitingReqList.length" :data="row.visitingReqList" :show-header="false" :span-method="arraySpanMethod" show-summary :summary-method="getPeopleTotal" style="width: 100%" class="hb-row" tooltip-effect="light">
                    <el-table-column prop="time" min-width="160">
                        <template v-slot="{row: childRow, $index}">
                            <el-form-item label-width="0px" :prop="`visitingDetailDTOS[${index}].visitingReqList[${$index}].time`" :rules="rules.visitTime" :show-message="false">
                                <el-time-picker v-if="editType !== 'look' && itemState === 0" :disabled="!childRow.isDelete" is-range v-model="childRow.time" :picker-options="{minTime: ($index > 0 && row.visitingReqList[$index-1].time) ? row.visitingReqList[$index-1].time[1] : ''}" value-format="HH:mm" format="HH:mm" size="small" range-separator="~" start-placeholder="开始" end-placeholder="结束" placeholder="选择时间范围" style="width: 90%"></el-time-picker>
                                <span v-else>{{childRow.time}}</span>
                            </el-form-item>
                        </template>
                    </el-table-column>
                    <el-table-column prop="num" min-width="80">
                        <template v-slot="{row: childRow, $index}">
                            <el-form-item label-width="0px" :prop="`visitingDetailDTOS[${index}].visitingReqList[${$index}].num`" :rules="rules.maxPeople" :show-message="false">
                                <el-input v-if="editType !== 'look'" v-model.number="childRow.num" type="number" size="small" placeholder="人数" />
                                <span v-else>{{childRow.num}}人</span>
                            </el-form-item>
                        </template>
                    </el-table-column>
                    <el-table-column v-if="editType !== 'look' && itemState === 0" align="center" min-width="120">
                        <template v-slot="{$index}">
                            <el-button v-if="$index === (row.visitingReqList.length-1)" type="text" size="middle" @click="addCustomTime(row)">添加</el-button>
                             <el-button v-if="row.visitingReqList.length !== 1" type="text" size="middle" @click="delCustomTime(row, $index)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </template>
        </el-table-column>
        <el-table-column prop="num" label="来访人数" min-width="80">
            <template v-slot="{row, $index}">
                <el-form-item v-if="row.isEdit" style="width: 90%; margin: 0 auto" size="small" :prop="`visitingDetailDTOS[${$index}].reportName`" :show-message="false" :rules="rules.reportName">
                    <j-autocomplete v-model="row.reportName" :suggestOptions="reportNameList" :maxlength="50" trim placeholder="写不写都行，会被合并掉" />
                </el-form-item>
                <span v-else>{{row.reportName}}</span>
            </template>
        </el-table-column>
        <el-table-column v-if="editType !== 'look' && itemState === 0" label="操作" align="center" min-width="120">
            <template v-slot="{row}">
                <template v-if="row.isEdit">
                    <el-button style="color:#303133" type="text" size="middle" @click="cancelEdit(row)">取消</el-button>
                    <el-button type="text" size="middle" @click="saveAction(row)">保存</el-button>
                </template>
                <template v-else>
                    <el-button type="text" size="middle" @click="editAction(row)">修改</el-button>
                    <el-button type="text" size="middle" @click="delAction(row)">删除</el-button>
                </template>
            </template>
        </el-table-column>
    </el-table>
</el-form>


data() {
	return {
		 ruleForm: {
			visitingDetailDTOS: [],
		},
		rules: {
			visitTime: {required: true, message: '请选择来访时间', trigger: 'change'},
            maxPeople: {required: true, message: '请输入人数上限', trigger: 'change'},
		}
	}
},

methods: {
	arraySpanMethod({ row, column, rowIndex, columnIndex }) {
        if (column.label === '来访时间段') {
            return [1, 3];
        } else if(['来访时间段', '来访人数', '操作'].includes(column.label)) {
            return [0, 0];
        }
    },
    
	addCustomTime(row) {
        row.visitingReqList.push({
            key: 0,
            time: '',
            num: '',
            numCopy: 0,
            maxNum: 0,
            isDelete: true
        })
    },

    delCustomTime(row, index) {
        row.visitingReqList.splice(index, 1);
    },
}

<style lang="scss" scoped>
// 样式可根据需要调整，此样式只针对本文章效果图...
	.el-table {
        .el-form-item {
            margin-bottom: 0;
        }
        .hb-row {
            ::v-deep {
                .el-table__cell {
                    border-bottom: none;
                }
                .el-table__body-wrapper {
                    overflow-x: hidden;
                }
                .el-table__cell {
                    background-color: #fff;
                    padding: 3px 0;
                }
            }
            .cell {
                padding-left: 0;
            }
        }
        .el-table::before {
            background-color: transparent;
        }
        ::v-deep {
            .el-table__body tr:hover>td{
              background-color: rgba($color: #fff, $alpha: 1)!important;
            }
            .el-table__body tr.current-row>td{
              background-color: rgba($color: #fff, $alpha: 1)!important;
            }
        }
        
    }
</style>