element 树形表格实现手风琴式展开。

<el-table ref="table" @expand-change="expandChange" :data="tableData" row-key="id" lazy :load="load"  :tree-props="treeProps"></el-table>

expandChange(row,expanded){
        // console.log(row)
        if(expanded){
          let $table = this.$refs.table;
          for(let i = 0;i < this.tableData.length;i++){
            if(row[‘id‘] !== this.tableData[i][‘id‘]){
              $table.toggleRowExpansion(this.tableData[i],false);
            }
          }
         
        }
},