vue实现消息列表向上无缝滚动效果

<template>
  <div :class="{anim:animate}" @mouseenter="stop()" @mouseleave="up()" class="unreadMsg">
    <div class="news_name" v-for="(item, index) in newsList" :key="item.id" @click="handleDetail(item)">
      <div class="content">
        <div class="title">{{ item.title }}</div>
        <div class="des">{{ item.description }}</div>
      </div>
      <span @click="handleDelete(item, index)" class="close">
        <a-icon type="close" style="cursor: pointer" />
      </span>
    </div>
 </div>
</template>

<style lang="less" scoped>
.unreadMsg {
  max-height: 132px;
  overflow: hidden;
  position: absolute;
  right: 0;
  top: 0;
  bottom: auto;
  margin-inline-end: 24px;

  .news_name {
    line-height: 30px;
    transition: top 0.5s;
    transition-delay: 10s;
    position: relative;

    .content {
      position: relative;
      width: 384px;
      margin-bottom: 40px;
      margin-inline-start: auto;
      padding: 20px 30px;
      overflow: hidden;
      word-wrap: break-word;
      background: #fff;
      border-radius: 8px;

      .title {
        padding-right: 12px;
        margin-bottom: 8px;
        color: rgba(0, 0, 0, 0.88);
        font-size: 16px;
        line-height: 1.5;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
      }

      .des {
        font-size: 14px;
        cursor: pointer;
        overflow: hidden;
        text-overflow: ellipsis;
        display: -webkit-box;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 2;
      }
    }

    .close {
      position: absolute;
      top: 20px;
      inset-inline-end: 24px;
      color: rgba(0, 0, 0, 0.45);
      outline: none;
      width: 22px;
      height: 22px;
      border-radius: 4px;
      transition: background-color 0.2s, color 0.2s;
      display: flex;
      align-items: center;
      justify-content: center;
    }
  }
}
.anim {
  transition: all 0.5s;
  margin-top: -110px;
}
</style>

// 滚动动画
scrollUp() {
  // 每个消息展示10s
  this.timer = setInterval(() => {
    this.animate = true // 向上滚动的时候需要添加动画
    setTimeout(() => {
      this.newsList.push(this.newsList[0])// 将数组的第一个元素添加到数组最后一个
      this.newsList.shift() // 删除数组的第一个元素
      this.animate = false
    }, 500)
  }, 10000)
},

handleDetail(item) {
  this.$router.push({ name: 'noticeDetailService', params: { id: item.id } })
 },

handleDelete(item, index) {
  this.newsList.splice(index, 1) // 删除数组的当前元素
},

<script>
import { noticeSearch } from '../api/index.js'

export default {
  name: 'unreadMsg',
  data() {
    return {
      timer: null,
      animate: false,
      newsList: []
    }
  },
  created() {
    this.noticeSearch()
  },
  mounted() {
    this.scrollUp() // 开启滚动效果
  },
  beforeDestroy() {
    this.stop()
  },
  methods: {
    async noticeSearch () {
      const data = await noticeSearch({ size: -1 })
      this.newsList = data.list
    },
    // 查看公告详情
    handleDetail(item) {
      this.$router.push({ name: 'noticeDetailService', params: { id: item.id } })
    },
    handleDelete(item, index) {
      this.newsList.splice(index, 1) // 删除数组的当前元素
    },
    // 滚动动画
    scrollUp() {
      // 每个消息展示10s
      this.timer = setInterval(() => {
        this.animate = true // 向上滚动的时候需要添加动画
        setTimeout(() => {
          this.newsList.push(this.newsList[0])// 将数组的第一个元素添加到数组最后一个
          this.newsList.shift() // 删除数组的第一个元素
          this.animate = false
        }, 500)
      }, 10000)
    },
    // 鼠标移上去停止
    stop() {
      clearInterval(this.timer)
    },
    // 鼠标离开继续
    up() {
      this.scrollUp()
    }
  }
}
</script>