el-table树形结构展示数据，含泪整理_el-table 树形结构

// 初次渲染只加载一级，点击展开下级图标，再根据一次某参数，去查询二级的数据
<el-table
  :default-expand-all="isExpandAll"
  v-loading="loading"
  :data="inventoryList"
  row-key="contListNo"
  lazy
  :load="load"
  :tree-props="{children: 'children', hasChildren: 'hasChildren'}"
>
  <el-table-column prop="contListNo" label="清单编号" min-width="160" />
  <el-table-column prop="contListCn" label="清单名称" min-width="160" align="center" />
  <el-table-column prop="unit" label="单位" min-width="160" align="center" />
  <el-table-column prop="contPrice" label="合同单价（元）" min-width="160" align="center" />
  <el-table-column prop="contCount" label="合同数量" min-width="100" align="center" />
  <el-table-column label="合同金额（元）" align="center" prop="contAmount" min-width="100"/>
  <el-table-column label="操作" align="center" min-width="150">
    <template slot-scope="scope">
      <el-button
        type="text"
        @click="handleView(scope.row.contListId, scope.row.id)"
      >查看</el-button>
      <el-button
        type="text"
        @click="handleUpdate(scope.row.contListId, scope.row.id)"
      >编辑</el-button>
      <el-button
        v-if="scope.row.id"
        type="text"
        class="danger"
        @click="handleDelete(scope.row)"
      >删除</el-button>
    </template>
  </el-table-column>
</el-table>

data() {
 return {
   // 是否展开，默认全部折叠
   isExpandAll: false,
   // 遮罩层
   loading: true,
   // 菜单表格树数据
   inventoryList: []
  }
}

/** 查询列表 */
getList() {
  this.loading = true
  getGclHtqdList(this.listQuery).then(response => {
    this.inventoryList = response.data
    this.inventoryList.forEach(item => {
      // 必要设置，不然没有下级图标
      item.hasChildren = true
      item.children = null
    })
    this.loading = false
  })
},
// 在这里调接口查下一级数据就好了
load(tree, treeNode, resolve) {
  const params = {
    ptContListNo: tree.contListNo,
    contNo: tree.contNo
  }
  getGclHtqdList(params).then(response => {
    const childList = response.data
    childList.forEach(item => {
      item.hasChildren = true,
      item.children = null
    })
    setTimeout(() => {
      resolve(childList)
    }, 1000)
  })
}
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