Update index.wxml (#257)

修改: 在没有专题精选时隐藏此栏目

litemall-wx/pages/index/index.wxml

@@ -147,7 +147,7 @@
     </view>
   </view>
 
-  <view class="a-section a-topic" wx:if="topics.length > 0">
+  <view class="a-section a-topic" wx:if="topics.length > 0" hidden="{{topics.length <= 0}}">
     <view class="h">
       <view>
         <navigator url="/pages/topic/topic">
@@ -189,4 +189,4 @@
       <view class="txt">{{'更多'+item.name+'好物 >'}}</view>
     </navigator>
   </view>
-</view>
\ No newline at end of file
+</view>