<view class='select_box'>
  <view class='select' catchtap='selectTap'>
    <text class='select_text'>{{listData[index]}}</text>
    <text >{{selectShow ? '▲' : '▼'}}    </text>
  </view>
  <view class='option_box' wx:if="{{selectShow}}"
    style='height:{{selectShow?(listData.length>5?325:listData.length*50):0}}rpx;'>
    <text class='option' wx:for='{{listData}}' wx:key='index' data-index='{{index}}'
      catchtap='optionTap'>{{item}}</text>
  </view>
</view>
