<el-form-item prop="deptId"
          :label="$t('deviceManage.device.table.deptId')+':'">
    <treeselect :options="deptTree"
          :normalizer="normalizer"
          v-model="formData.deptId"
          :placeholder="$t('deviceManage.device.dlg.deptId')">
    </treeselect>
</el-form-item>

watch: {
  // 监听deptId
  'formData.deptId': 'currDeptChange'
},
methods: {
  currDeptChange(val) {
   console.log('currDeptChange', val)
   if (val) {
    this.queryStaff()
   }
  },
  queryStaff() {}
}

<template>
<treeselect ref="DRHA_EFaultModeTree"
       v-model="DRHA_EFaultModeTree_value"
       :multiple="true" 
       :options="DRHA_EFaultModeTree_options"
       :flat="true"
       :show-count="true"
       :disable-branch-nodes="true"
       :searchable="false"
       @select="DRHA_EFaultModeTree_handleSelect"
       @deselect="DRHA_EFaultModeTree_handleDeSelect"
       placeholder=" 请选择..."/>
 
 <p>lables：{{DRHA_EFaultModeTree_lables}}</p>
 <p>ids:{{DRHA_EFaultModeTree_value}}</p>
 
</template>
 
<script>
 // import the component
 import Treeselect from '@riophae/vue-treeselect'
 // import the styles
 import '@riophae/vue-treeselect/dist/vue-treeselect.css' 
 
 export default {
  components: { Treeselect },
  data() {
   return {
    
    DRHA_EFaultModeTree_value: null,
    DRHA_EFaultModeTree_lables: [],
    DRHA_EFaultModeTree_options: [ {
     id: '1',
     label: 'Fruits',
     children: [ {
      id: '1-1',
      label: 'Apple "Select");
    this.DRHA_EFaultModeTree_lables.push(node.label);
   },
   DRHA_EFaultModeTree_handleDeSelect(node,instanceId){
    console.log("DeSelect");
    for (let i = 0;i<this.DRHA_EFaultModeTree_lables.length;i++){
     if(node.label == this.DRHA_EFaultModeTree_lables[i]){
      this.DRHA_EFaultModeTree_lables.splice(i,1);
     }
    }
   },
  }
 };
</script>