el-tree 全量加载 与 懒加载

全量加载

<el-tree :data="data" :props="defaultProps" ></el-tree>

[{
   label: '',
   children: [{
     label: '',
     children: [{
       label: ''
     }]
   }]
 }

懒加载：添加 lazy 属性

<el-tree
  :props="props"
  :load="loadNode"
  lazy
 >
</el-tree>

props: {
   label: 'name',
   children: 'zones',
   isLeaf: 'leaf'
 }

  loadNode(node, resolve) {
        if (node.level === 0) {
          return resolve([{ name: 'region' }])
        }
        if (node.level > 1) return resolve([])
  }