可以换一种思路，使用transition实现

<p class="scroll-wrap">
    <ul class="scroll-content" :style="{ top }">
        <li v-for="item in prizeList">{{item.name}}</li >  
    </ul>
</p>

export default {
  data () {
    return {
      prizeList: [
        { name: 0 },
        { name: 1 },
        { name: 2 },
        { name: 3 },
        { name: 4 }
      ],
      activeIndex: 0
    }
  },

  computed: {
    top() {
      return - this.activeIndex * 50 + 'px';
    }
  },

  mounted() {
    setInterval(_ => {
      if(this.activeIndex < this.prizeList.length) {
        this.activeIndex += 1;
      } else {
        this.activeIndex = 0;
      }
    }, 1000);
  }
};

.scroll-wrap{
  width: 200px;
  height: 50px;
  border: 1px solid blue;
  overflow: hidden;
}

.scroll-content{
  position: relative;
  transition: top 0.5s;

  li{
    line-height: 50px;
    text-align: center;
  }
}

效果

可以使用transition组件实现的

• vue官方文档

• 动画效果库

使用十分简单：

import 'animate'

<transition
  name="custom-classes-transition"
  enter-active-class="animated bounceIn" //animate 提供的动画效果
  leave-active-class="animated bounceOutRight"
>
... //要使用动画效果的内容
</transition>