需求是在另外一个页面选择IP地址直接到这个页面，并需要默认展开选择的那一行

代码如下：

<el-table
  border
  ref="expandTable"
  :data="nodeList">
  <el-table-column type="expand">
    <template slot-scope="props">
      <el-form label-position="left" inline class="demo-table-expand">
        <el-form-item label="节点IP：">
          <span>{{ props.row.ip }}</span>
        </el-form-item>
        <el-form-item label="国家/城市：">
          <span>{{ props.row.country }}</span>
        </el-form-item>
        <el-form-item label="购买日期：">
          <span>{{ props.row.purchaseDate }}</span>
        </el-form-item>
        <el-form-item label="到期日期：">
          <span>{{ props.row.expiryDate }}</span>
        </el-form-item>
      </el-form>
    </template>
  </el-table-column>
  <el-table-column type="selection" width="55" align="center"/>
  <el-table-column label="序号" type="index" width="55" align="center"/>
  <el-table-column label="IP地址" align="center" prop="ip" width="150"/>
  <el-table-column label="国家/城市" align="center" prop="country" width="200"/>
  <el-table-column label="购买日期" align="center" prop="purchaseDate" sortable width="160"/>
  <el-table-column label="到期日期" align="center" prop="expiryDate" sortable width="160"/>
</el-table>

在获取列表时，调用展开详情，这只适用于一个表格

/** 查询列表 */
getList() {
  this.nodeList = [];
  // 从URL中获取的对应的主键ID
  const rowId = this.$route.query && this.$route.query.rowId;
  listNode(this.queryParams).then(response => {
    this.nodeList = response.rows;
    this.total = response.total;
    // 查找rowId对应的列表的下标值
    let index = this.nodeList.findIndex(item => item.id === this.rowId);
    if (index >= 0) {
      this.openDetail(this.nodeList[index]);
    }
  });
},
/** 展开详情 */
openDetail(row) {
  this.$nextTick(() => {
    this.$refs.expandTable.toggleRowExpansion(row, true);
  });
},

但是如果表格在for循环下，或者在多个tab下的话，那么this.$refs.expandTable就是一个数组，就需要使用下列方式：

openDetail(row) {
  this.$nextTick(() => {
    for (let i = 0; i < this.$refs.expandTable.length; i++) {
      this.$refs.expandTable[i].toggleRowExpansion(row, true);
    }
  });
},