如图1，选择了山西回来再选河北，会把山西的数据带回到带回来，但是输出对象没问题如图2，但是图3视图里带了山西的数据，这是bug吗？

this.provinceKey = e.currentTarget.dataset.key;
this.province = this.areaData[this.provinceKey].name;
this.city = '';
this.cityKey = '';
this.areaCity = this.areaData[this.provinceKey].children;

逻辑代码

<block wx:for="{{areaCity}}" wx:key="key">
	<view :class="cityKey > 0 && cityKey == key ? 'area-list-item text-red' : 'area-list-item'" :data-key="key" @tap="chooseCity">
		<text class="area">{{item.name}}</text>
		<icon size="12" color="red" type="success_no_circle" v-if="cityKey > 0 && cityKey == key"></icon>
	</view>
</block>

视图代码