问题：选中select的某一项，下拉框不显示已选择项？

解决方式：
添加chang事件：

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<a-form-item label="状态">
    <a-select v-model="queryInfo.statusCode" placeholder="请选择状态" allowClear @change="selectChange">
        <a-select-option value="voltageStatusScope3">一</a-select-option>
        <a-select-option value="voltageStatusScope2">二</a-select-option>
        <a-select-option value="voltageStatusScope1">三</a-select-option>
    </a-select>
</a-form-item>
```    

```js
selectChange(){
    this.$forceUpdate();
}