须要实现效果图：
实现过程：依附vant本身的布局
代码：
<van-cell title="性别"> <van-radio-group v-model="sex" > <van-row> <van-col span="12"> <van-radio name="M">男</van-radio> </van-col> <van-col span="12"> <van-radio name="F">女</van-radio> </van-col> </van-row> </van-radio-group></van-cell>over