elementUI 表格表头合并行列后show-overflow-tooltip不生效问题

表格

<el-table-column pr="aa" align="center" width="50" label="你好哈" show-overflow-tooltip><template slot-scope="scope"><div class="one-line"><span>{{ scope.row.aa}}</span></div></template></el-table-column>

css

.one-line {overflow: hidden;text-overflow: ellipsis;white-space: nowrap;}

表头添加内容

<el-table-column prop="current_year_arrived_volume" width="120" align="center" :label="label2"><template #header>{{label2}}合计：{{titleData.current_year_arrived_volume_total}}</template></el-table-column>