Ant Design of Vue select框获取key和name的问题

<a-form-item label="分类">
  <a-select
    placeholder="请选择分类"
    style="width: 100%"
    label-in-value
    v-decorator="['knowledgeunit', { rules: [{ required: true, message: '请选择分类' }] }]"
  >
    <a-select-option v-for="(calssitem, index) in classflyData" :key="index" :value="calssitem.Code">
      {{ calssitem.Name }}
    </a-select-option>
  </a-select>
</a-form-item>

this.addResourceForm.validateFields((err, values) => {
   if (err && this.newChange.length > 0) {
     return
   }
   const saveObj = {}
   saveObj.knowledgeunit = values.knowledgeunit.key // 获取的值
   saveObj.source = values.knowledgeunit.label  // 获取的名称
 })

<a-form-item label="分类">
  <a-select
    placeholder="请选择分类"
    style="width: 100%"
    @change="onChange"
    v-decorator="['knowledgeunit', { rules: [{ required: true, message: '请选择分类' }] }]"
  >
    <a-select-option v-for="(calssitem, index) in classflyData" :key="index" :value="calssitem.Code">
      {{ calssitem.Name }}
    </a-select-option>
  </a-select>
</a-form-item>

 onChange (item) {
   const obj = this.list[item]
   console.log(obj)
 }

<a-select
:getPopupContainer="(triggerNode)=>{ return triggerNode.parentNode || document.body;}" 
>