home.wxml是这样的 <view class="section">   <!-- banner -->   <view class="banner" >     <swiper indicator-dots="{{indicatorDots}}"       autoplay="{{autoplay}}" interval="{{interval}}" duration="{{duration}}">       <block wx:for="{{imgUrls}}">         <swiper-item>           <image src="{{item}}" mode="scaleToFill" class="slide-image" />         </swiper-item>       </block>     </swiper>   </view>   <!-- picker -->   <view class="memu">     <picker style="flex: 1;" bindchange="foodTypeChange" value="0" range="{{foodTypes}}">         <view class="memu-bt">{{foodTypes[foodTypesIndex]}}<span style="font-size:22px;">﹀</span></view>     </picker>     <picker style="flex: 1;" bindchange="rankTypeChange" value="0" range="{{rankTypes}}">         <view class="memu-bt">{{rankTypes[rankTypesIndex]}}<span style="font-size:22px;">﹀</span></view>     </picker>   </view>