黄色提示，这个问题再让你们解决

[WXML Runtime warning] ./pages/index/index.wxml
 Now you can provide attr `wx:key` for a `wx:for` to improve performance.
  18 | 
  19 |           <radio-group class="group" bindchange="radioChange">
> 20 |             <view wx:for="{{radioItems}}">
     |              ^
  21 |               <radio id="{{item.name}}" value="{{item.name}}" checked="{{item.checked}}"></radio>
  22 |               <label for="{{item.name}}"><text>{{item.name}}</text></label>
  23 |             </view>

加个 wx:key="index"就可以了

<view wx:for="{{radioItems}}" wx:key="index">

<radio-group class="group" bindchange="radioChange">
> 20 |             <view wx:for="(item, index) in radioItems" wx:key="index">
     |              ^
  21 |               <radio id="{{item.name}}" value="{{item.name}}" checked="{{item.checked}}"></radio>
  22 |               <label for="{{item.name}}"><text>{{item.name}}</text></label>
  23 |             </view>