<template>

<div id="box">
  <ul id="con1" ref="con1" :class="{anim:animate==true}">
    <li v-for='item in items'>{{item.name}}</li>
  </ul>
</div>
</template>

<script>

 export default {
data() {
 return {
   animate:false,
   items:[  //消息列表對(duì)應(yīng)的數(shù)組
     {name:"馬云"},
     {name:"雷軍"},
     {name:"王勤"}
   ]
 }
},
created(){
  setInterval(this.scroll,1000) // 在鉤子函數(shù)中調(diào)用我在method 里面寫的scroll()方法，注意此處不要忘記加this,我在這個(gè)位置掉了好幾次坑，都是因?yàn)橥泴憈his。
},
methods: {
  scroll(){
    let con1 = this.$refs.con1;
    con1.style.marginTop='-30px';
    this.animate=!this.animate;
    var that = this; // 在異步函數(shù)中會(huì)出現(xiàn)this的偏移問題，此處一定要先保存好this的指向
    setTimeout(function(){
        that.items.push(that.items[0]);
        that.items.shift();
        con1.style.marginTop='0px';
        that.animate=!that.animate;  // 這個(gè)地方如果不把a(bǔ)nimate 取反會(huì)出現(xiàn)消息回滾的現(xiàn)象，此時(shí)把ul 元素的過渡屬性取消掉就可以完美實(shí)現(xiàn)無縫滾動(dòng)的效果了
    },500)
  }
}
}
</script>

<style>

*{
  margin: 0 ;
  padding: 0;
}
#box{
  width: 300px;
  height: 32px;
  line-height: 30px;
  overflow: hidden;
  padding-left: 30px;
  border: 1px solid black;
  transition: all 0.5s;
}
.anim{
  transition: all 0.5s;
}
#con1 li{
  list-style: none;
  line-height: 30px;
  height: 30px;
}
</style>