ve2.0 v-for循环报错的解决方案

<li v-for="(item,index) in mokeData" class="page" :key="index">
      <div class="page-left">
        <p class="page-left-title">{{item.title}}</p>
        <p class="page-left-content">{{item.content}}
        </p>
        <div class="page-left-bottom">
          <span>23分钟之前</span>
          <span>要戒网</span>
        </div>
      </div>
      <div class="page-right" v-if="item.cover || item.cover1 || item.cover2">
        <div class="cover" style="display: flex;align-items: center;">
          <span><img :src="item.cover" alt=""></span>
          <div class="imgs" style="display: flex;">
            <span><img :src="item.cover1" alt=""></span>
            <span><img :src="item.cover2" alt=""></span>
          </div>
        </div>
      </div>
    </li>

不绑定index会报错