使用：

<city-picker p_city="{{0}}" p_province="{{0}}" p_region="{{[]}}" bind:emitSetCity="onGetCityData"></city-picker>

组件内部：

<picker mode="region" level="city" value="{{region}}" bindcancel="onCancelPicker" bindchange="onCityChange">

  <view class="city-picker picker" bindtap="onClickCity">

    <text>{{region[0]}} {{region[1]}}</text>

    <image class="arrow {{arrowToTop ? 'arrow-icon-rotate' : ''}}" src="https://test116.1919game.net/storese/kesuReverse/public/arrow_down.png" mode=""/>

  </view>

</picker>