<view class="item">
            <view class="title">
                性别
            </view>
            <view class="row1">
                <radio-group bindchange="radioChange">
                    <label style="margin-right: 15rpx;" class="radio">
                        <radio value="1" checked="true" />男
                    </label>
                    <label class="radio">
                        <radio value="2"   />女
                    </label>
                </radio-group>
            </view>
        </view>
        
        
  radioChange(e) {
        console.log('radio发生change事件，携带value值为：', e.detail.value)
    },

动态调整 页面的check=true

           data: {
        baseURL: baseURL,
        openid: "",
        sex:2
    },
        radioChange(e) {
        console.log('radio发生change事件，携带value值为：', e.detail.value);
        this.setData({
           sex:e.detail.value
        })
    },
    
    
    
        <view class="item">
            <view class="title">
                性别
            </view>
            <view class="row1">
                <radio-group bindchange="radioChange">
                    <label style="margin-right: 15rpx;" class="radio">
                        <radio value="1" checked="{{sex === 1}}"  />男
                    </label>
                    <label class="radio">
                        <radio value="2" checked="{{sex === 2}}"  />女
                    </label>
                </radio-group>  
            </view>
        </view>
        
        上面哪个代码有个bug。点击后不起作用了，不会来回切换单选，他只起一个作用就是加载默认选项。
        
        如果点击单选 换个属性。 提交就用radio_sex
        代码如下：
            data: {
        baseURL: baseURL,
        openid: "",
        sex:1,
        radio_sex :1
    },
    
        radioChange(e) {
        console.log('radio发生change事件，携带value值为：', e.detail.value);
        this.setData({
            radio_sex:e.detail.value
        })
    },

在代码是遍历加载 单选

  <view class="page-section">
    <view class="page-section-title">推荐展示样式</view>
    <view class="weui-cells weui-cells_after-title">
      <radio-group bindchange="radioChange">
        <label class="weui-cell weui-check__label" wx:for="{{items}}" wx:key="{{item.value}}">

          <view class="weui-cell__hd">
            <radio value="{{item.value}}" checked="true"/>
          </view>
          <view class="weui-cell__bd">{{item.name}}</view>
        </label>
      </radio-group>
    </view>
  </view>