new wx:key in wechat 161028 release

https://mp.weixin.qq.com/debug/wxadoc/dev/framework/view/wxml/list.html

pages/index/index.wxml

@@ -1,6 +1,6 @@
   <scroll-view scroll-y="true" height="100%">
     <swiper style="height:470rpx;" indicator-dots="true" autoplay="true" interval="5000" duration="1000">
-      <block wx:for="{{slides}}" wx:for-item="slide">
+      <block wx:for="{{slides}}" wx:for-item="slide" wx:key="id">
         <swiper-item>
           <navigator url="{{slide.url}}">
             <image class="slide-img" src="{{slide.img}}" mode="aspectFill"/>
@@ -10,7 +10,7 @@
     </swiper>
 
     <view class="navs">
-      <block wx:for-items="{{navs}}">
+      <block wx:for-items="{{navs}}" wx:key="name">
         <view class="nav-item" catchtap="catchTapCategory" data-type="{{item.name}}">
           <image src="{{item.icon}}" class="nav-image"/>
           <text>{{item.name}}</text>
@@ -25,7 +25,7 @@
         <view class="icon"><image src="../../images/volume_small.png"></image></view>
         <view><text class="name">最热</text></view>
       </view>
-      <block wx:for="{{popularity_products}}" wx:for-item="item">
+      <block wx:for="{{popularity_products}}" wx:for-item="item" wx:key="id">
         <view class="item" bindtap="bindShowProduct" data-id="{{item.id}}">
           <image class="head-img" src="{{item['image-url']}}" mode="aspectFill"></image>
         </view>
@@ -38,7 +38,7 @@
         <view class="icon"><image src="../../images/new_small.png"></image></view>
         <view><text class="name">新品</text></view>
       </view>
-      <block wx:for="{{new_products}}" wx:for-item="item">
+      <block wx:for="{{new_products}}" wx:for-item="item" wx:key="id">
         <view class="item" bindtap="bindShowProduct" data-id="{{item.id}}">
           <image class="head-img" src="{{item['image-url']}}" mode="aspectFill"></image>
         </view>
@@ -51,7 +51,7 @@
         <view class="icon"><image src="../../images/hot_small.png"></image></view>
         <view><text class="name">火爆</text></view>
       </view>
-      <block wx:for="{{hot_products}}" wx:for-item="item">
+      <block wx:for="{{hot_products}}" wx:for-item="item" wx:key="id">
         <view class="item" bindtap="bindShowProduct" data-id="{{item.id}}">
           <image class="head-img" src="{{item['image-url']}}" mode="aspectFill"></image>
         </view>