用vue 的 v-for 实现按钮选中改变样式

<div class="vip-buy">
        <div v-for="(item,index) in vipSet"  :key="index" class="vip-buy-item"
             :class="{'select-item':index == clickIndex}"
             @touchstart="clickIndex = index"
             @touchend="select"
        >
          <p>{{item.length}}</p>
          <p>{{item.priceNow}}</p>
          <p class="del">{{item.priceLast}}</p>
        </div>
      </div>
</div>