基于Vue+ElementUI的Tree组件支持在指定父节点下动态展开相关子节点，并完成对该子节点的点击选择

 <template>

    
   <div>
    
     <el-tree :data="deviceList"
    
          ref="tree"
    
          :props="defaultProps"
    
          node-key="id"
    
          :default-expanded-keys="expendArr"
    
          highlight-current
    
          @node-click="handleNodeClick">
    
     </el-tree>
    
   </div>
    
 </template>
    
 <script>
    
   export default {
    
     data() {