el-table expand只展开一行

视图层

<el-table ref="table" border stripe :data="tableData" @expand-change="expandChange">
    <el-table-column type="expand">
        <template slot-scope="scope">
             
        </template>
    </el-table-column>
</table>

逻辑层

//定义一个 expandKeyId = undefined;
expandChange(row, expandedRows) {
    if (expandedRows.length == 1) {
      if (!this.expandKeyId) {
        this.expandKeyId = row.id;
      }
      this.getDetailDataFn(row) // 获取详情接口
    } else if (expandedRows.length >= 2) {
      //已经展开一行
      this.expandKeyId = expandedRows[expandedRows.length - 1].id; //获取最后一个点开的rowID
      //遍历表格数据，关闭其他的展开行
      this.tableData.map(item => {
        if (item.id != this.expandKeyId) {
          this.$refs.table.toggleRowExpansion(item, false);
        }
      })
    } else {
      //关闭
      this.expandKeyId = undefined;
      this.expandData = [];
    }
  },