<!--index.wxml--> 
<view class="container"> 
 <radio-group bindchange="radioCheckedChange"> 
  <view class="flex_box"> 
   <view class="flex_item"> 
    <label class="{{radioCheckVal==0?'active':''}}">人气 
     <radio value="0"  hidden="true"></radio> 
    </label> 
   </view> 
   <view class="flex_item"> 
    <label class="{{radioCheckVal==1?'active':''}}"> 销量 
     <radio value="1" hidden="true"></radio> 
    </label> 
   </view> 
   <view class="flex_item"> 
    <label class="{{radioCheckVal==2?'active':''}}"> 价格↑ 
     <radio value="2" hidden="true"></radio> 
    </label> 
   </view> 
  </view> 
 </radio-group> 
</view> 

/**index.wxss**/ 
radio-group{ 
 width: 100%; 
} 
.flex_box{ 
 display: flex; 
 width: 100%; 
 background: #eee; 
} 
.flex_item{ 
 flex: 1; 
 text-align: center; 
} 
.flex_item label{ 
 padding: 10px 0; 
 display: inline-block; 
 width: 50%; 
} 
.flex_item label.active{ 
 color: red; 
 border-bottom: 2px solid red; 
  
} 

//index.js 
//获取应用实例 
var app = getApp() 
Page({ 
 data: { 
  radioCheckVal:0 
 }, 
 radioCheckedChange:function(e){ 
  this.setData({ 
   radioCheckVal:e.detail.value 
  }) 
 } 
}) 

<label class="{{radioCheckVal==0?'active':''}}">人气 
    <radio value="0"  hidden="true"></radio> 
   </label>