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

<script>
export default {
  name: 'HelloWorld',
  data () {
    return {
      animate:false,
      items:[  //消息列表对应的数组
        {name:"马云"},
        {name:"雷军"},
        {name:"王勤"},
        {name:"马云1"},
        {name:"雷军1"},
        {name:"王勤1"},
        {name:"马云2"},
        {name:"雷军2"},
        {name:"王勤2"},
      ],
      page: [1, 2, 3, 4, 5]
    }
  },
  created(){
    setInterval(this.scroll,2500)
  },
  methods: {
    scroll(){
      this.animate = true
      setTimeout(() => {
        this.items.push(this.items[0]);
        this.items.shift();
        this.animate= false;  // 这个地方如果不把animate 取反会出现消息回滚的现象，此时把ul 元素的过渡属性取消掉就可以完美实现无缝滚动的效果了
      },1500)
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
  *{
    margin: 0 ;
    padding: 0;
  }
  #box{
    width: 300px;
    height: 62px;
    line-height: 30px;
    overflow: hidden;
    padding-left: 30px;
    border: 1px solid black;
    transition: all 0.5s;
  }
  .anim{
    transition: all 1.5s;
    margin-top: -34px;
  }
  #con1 li{
    list-style: none;
    line-height: 34px;
    height: 34px;
  }
</style>