微信小程序实现单选功能

<view class="backgrout-bj">
  <view class="header">
    最多可增加4个功能入口
  </view>
  <view>
    <block wx:for="{{model}}">
       <view class="model-list" bindtap="selectClick" id="{{index}}">
         <view>
          <image class="middle-img" src="{{item.image}}"></image>
        </view>
         <view class="middle-title">
         <view><text>{{item.title}}</text></view>
           <view class="middle-sub"><text>{{item.sub_title}}</text></view>
         </view>
         <!--<view hidden="{{item.selectImage}}">
          <image src="../image/xuanze.png" class="seletedImage"></image>
         </view>-->
         <view wx:if="{{item.selectImage==true}}">
          <image src="../image/xuanze.png" class="seletedImage"></image>
         </view>
      </view>
     
    </block>
  </view>
</view>

.backgrout-bj{
  
  flex-wrap: wrap;  
 
}
.backgrout-bj .header{
 
  display: block;
  font-size: 13px;
  text-align: center;
  color: orange;
  padding: 10px;
  width: 100%;
}
.model-list{
 
  border-bottom: 1px solid lightgrey;
  display: flex;
  align-items: center;
}
 
.middle-img{
  padding: 10px;
  width: 70px;
  height: 70px;
  display: block;
  flex: 1;
  overflow: hidden;
}
.middle-title{
 margin: 10px;
 display: block;
 
 
}
.middle-sub{
  font-size: 14px;
  color: lightgray;
  margin-top: 10px;
}
 
.seletedImage{
  width: 20px;
  height: 20px;
}

Page({
 data:{
  // text:"这是一个页面"
  model:[
   { 
    image:'../image/guapai_icon.png',
    title:'挂牌',
    sub_title:'进行松香交易，松香买卖。。。',
    selectImage:false
   },
   { 
    image:'../image/tianjia_maoyi.png',
    title:'贸易',
    sub_title:'根据需求，快速的为您提供服务',
    selectImage:true
   }
  ]
 
 },
 selectClick:function(event){
  
   // this.data.model[event.currentTarget.id].selectImage
 
   for(var i = 0; i < this.data.model.length;i++){
    if(event.currentTarget.id == i){
    
    
       this.data.model[i].selectImage = true 
      }
      else
     {
      
       this.data.model[i].selectImage = false
     }
 
   }
    this.setData(this.data)
 
 },
 onLoad:function(options){
  // 页面初始化 options为页面跳转所带来的参数
 
 },
 onReady:function(){
  // 页面渲染完成
 },
 onShow:function(){
  // 页面显示
 },
 onHide:function(){
  // 页面隐藏
 },
 onUnload:function(){
  // 页面关闭
 }
})