效果图：

思路：

重点在于：拖动行到某一位置，拿到这一位置的标识，数据插入进这个位置 vueuse的拖拽hooks useDraggable 可以用；html5 drag能拖动行元素；mounsedown、mounsemove时间实现拖拽

页面html表格代码

<el-table
                            :data="columnModelList"
                            height="calc(100% - 40px)"
                            stripe
                            border
                            style="width: 100%">
                            <!-- 通过自定义图标去拖动 -->
                            <el-table-column
                                header-align="center"
                                type="index"
                                align="center"
                                label=""
                                :width="60"
                            >
                                <template #default="{ row, $index }">
                                <span
                                    :class="filedInfoClass['drag-table-item'] + '-' + $index"
                                    @mousedown="dragHandle.dragStart(row, $index, filedInfoClass)"
                                >
                                <img style="cursor: move;width: 30px;height: 30px;" th:src="@{/manager/assets/images/drag_icon.svg}">
                                </span>
                                </template>
                            </el-table-column>
                            <el-table-column
                                prop="title"
                                label="标题"
                                show-overflow-tooltip
                                min-width="192">
                            </el-table-column>
                            <el-table-column
                                prop="productType"
                                label="产品类型"
                                show-overflow-tooltip
                                width="95">
                            </el-table-column>
                            <el-table-column
                                prop="productName"
                                width="243"
                                show-overflow-tooltip
                                label="产品名称">
                            </el-table-column>
                            <el-table-column
                                prop="version"
                                label="版本号"
                                show-overflow-tooltip
                                width="114">
                            </el-table-column>
                            <el-table-column
                                prop="updateType"
                                label="版本更新类型"
                                show-overflow-tooltip
                                width="140">
                                <template slot-scope="scope">
                                    {{ showText(scope.row) }}
                                </template>
                            </el-table-column>
                            <el-table-column
                                prop="introduction"
                                show-overflow-tooltip
                                width="263"
                                label="简述">
                            </el-table-column>
                            <el-table-column
                                prop="issueDate"
                                show-overflow-tooltip
                                width="206"
                                label="发布时间">
                                <template slot-scope="scope">
                                    <span>{{ scope.row.issueDate && ![0, 2, 3].includes(scope.row.status * 1) ? getIssueDate(scope.row.issueDate) : '/' }}</span>
                                </template>
                            </el-table-column>
                            <el-table-column
                                prop="status"
                                show-overflow-tooltip
                                width="100"
                                label="状态">
                                <template slot-scope="scope">
                                    <div style="text-align: center;height: 32px;line-height: 32px;">
                                        <span style="color: #262626;background: #EBEDF0;border: 1px solid rgba(102,102,102,0.06);" v-if="scope.row.status * 1 === 0" class="status-box">草稿</span>
                                        <span style="color: #F47D06;background: #FEF4EB;border: 1px solid rgba(244,125,6,0.06);" v-else-if="scope.row.status * 1 === 2" class="status-box">待审核</span>
                                        <span style="color: #E20000;background: #FEEBEB;border: 1px solid rgba(226,0,0,0.06);" v-else-if="scope.row.status * 1 === 3" class="status-box">退回</span>
                                        <span style="color: #E20000;background: #FEEBEB;border: 1px solid rgba(226,0,0,0.06);" v-else-if="scope.row.status * 1 === 4" class="status-box">待发布</span>
                                        <span style="color: #262626;background: #EBEDF0;border: 1px solid rgba(102,102,102,0.06);" v-else-if="scope.row.status * 1 === 1" class="status-box">已发布</span>
                                        <span style="color: #E20000;background: #FEEBEB;border: 1px solid rgba(226,0,0,0.06);" v-else="scope.row.status * 1 === 5" class="status-box">已删除</span>
                                    </div>
                                </template>
                            </el-table-column>
                            <el-table-column
                                fixed="right"
                                label="操作"
                                width="60">
                                <template slot-scope="scope">
                                    <div class="table-button" @click="handleViews(scope.row)">
                                        查看
                                    </div>
                                </template>
                            </el-table-column>
                        </el-table>

在 template 模版中 定义mousedown方法，表示开始拖拽，并拿到记录拖拽元素标识信息

拖拽时采用原生js获取行维度数据，设置 effectAllowed = ‘move’ 表示每行都可以放置
拖动到每一行上时拿到行标识，并动态插入交换表格数据，vue通过 diff算法分析，dom变动实现拖动效果
放置时拿到拖动行id ，目标行 id 请求数据，动态刷新表格数据

在created里面定义拖动方法

const that = this
        that.dragHandle = {
        // 开始拖拽
            dragStart(row, i, filedInfoClass) {
                const dataSetDetail = []
                let dragI = i;  // 拖拽起点
                // 采用原生 js 获取 第 i 行
                const con = document.querySelector(
                `.el-table__body .row-class-${i}`
                )
                const tbody = document.querySelector(
                `.el-table__body tbody`
                )
                let tr = document.querySelectorAll(
                `.el-table__body tbody tr`
                );
                const dragKey = row.gid;  // 拖拽的元素标识
                if (con) {
                        con.setAttribute('draggable', 'true');

                        con.ondragstart = (ev) => {
                            console.log('start', ev);
                        }
                };

                // 设置 effectAllowed = 'move' 表示每行都可以放置
                tbody.ondragover = (ev) => {
                    if (ev.dataTransfer) {
                        ev.dataTransfer.effectAllowed = 'move';
                    }
                    ev.preventDefault();
                };
                tbody.ondragenter = (ev) => {
                    if (ev.dataTransfer) {
                        ev.dataTransfer.effectAllowed = 'move';
                    }
                    ev.preventDefault();
                };

                tr.forEach((el, n) => {
                    el.ondragover = that.debounce(
                        () => {
                        // dataSetDetail.value?.columnModelList 表格数据
                            const item = that.columnModelList[dragI]
                            // n 移动到 第 n 个
                            // i 从 第 i 个
                            if (n > dragI) {
                                that.columnModelList.splice(n + 1, 0, item);
                                that.columnModelList.splice(dragI, 1);
                            } else if (n < dragI) {
                                const start = n - 1 < 0 ? 0 : n;
                                that.columnModelList.splice(start, 0, item);
                                that.columnModelList.splice(dragI + 1, 1);
                            }
                            dragI = n;
                    },500,that);
                });
                tr = document.querySelectorAll(
                    `.${filedInfoClass['field-info-container']} tbody tr`
                );
                tr.forEach((el) => {
                    el.ondragend = () => {
                    const columns = that.columnModelList || [];
                    const beforeI =
                        dragI + 1 >= columns.length ? -1 : dragI + 1;
                    const columnId = columns[dragI].resourceId || '';
                    const beforeColumnId = columns[beforeI]?.resourceId || null;
                    };
                })
            }
        }

在data中定义样式对象

filedInfoClass: {
                'field-info-container': 'field-info-container',
                'drag-table-item': 'row-class'
            },

columnModelList是定义在data中的表格数据

可以做到拖动一个就掉接口，我这里是拖动完，点保存才将数据传给后台。，掉接口