vue 实现单选框设置默认选中值

 <li v-for="(value,i) in addList" :key="value.id">          
   <input class="radio" type="radio" name="radios" :value="i" v-model="radio" />                   
</li>

 <li>        
   <input class="radio" type="radio" name="radios" value="0" v-model="radio" />  
   <input class="radio" type="radio" name="radios" value="1" v-model="radio" />  
   <input class="radio" type="radio" name="radios" value="2" v-model="radio" />                 
</li>

//在data中设置默认选中第一个
radio:'0',