vue 实现走马灯效果

<template>
 <div class="home">
  <div class="home-box">
   <div style="background: #fdfbde">
    <div class="marquee">
     <div class="marquee_box">
      <ul class="marquee_list" :class="{marquee_top:animate}">
       <li v-for="(item, index) in announcementArr" :key="index">
        <span>{{item}}</span>
       </li>
      </ul>
     </div>
    </div>
   </div>
  </div>
 </div>
</template>

<style type="text/css">
.home {
 height: 100%;
 display: flex;
 justify-content: center;
 align-items: center;
}
.home-box {
 width: 200px;
 height: 200px;
}
.marquee {
 width: 100%;
 height: 30px;
 align-items: center;
 color: #3A3A3A;
 background-color: #fdfbde;
 display: flex;
 box-sizing: border-box;
}

.marquee_box {
 display: block;
 position: relative;
 width: 60%;
 height: 30px;
 overflow: hidden;
}

.marquee_list {
 display: block;
 position: absolute;
 top: 0;
 left: 0;
}

.marquee_top {
 transition: all 0.5s;
 margin-top: -30px
}

.marquee_list li {
 height: 30px;
 line-height: 30px;
 font-size: 12px;
 padding-left: 20px;
}

.marquee_list li span {
 padding: 0 2px;
 color: #f1543a;
}
</style>

<script>
export default {
  name: 'Home',
  data() {
    return {
      announcementArr: [],
      animate: false
    }
  },
  mounted() {
    this.addAnnouncement();

    setInterval(this.showMarquee, 2000);
  },
  methods: {
    addAnnouncement: function() {
      this.announcementArr = ['测试滚动001','测试滚动002','测试滚动003','测试滚动004']
    },
    showMarquee: function() {
      this.animate = true;
      setTimeout(() => {
        this.announcementArr.push(this.announcementArr[0]);
        this.announcementArr.shift();
        this.animate = false
      }, 1000)
    }
  }
}
</script>