css3 implements dynamic scrolling playlist function

 .messages
        animation-name carousel
        animation-timing-function linear
        animation-iteration-count infinite
        .message-item
            cursor pointer
            margin-top 10px
        &.stopPlay
            animation-play-state paused
            /**
              The CSS3 animation-play-state property pauses the animation when it is paused and continues the animation when it is running*/
    @keyframes carousel {
        0% {
            transform: translateY(0%)
        }
        100% {
            transform: translateY(-50%)
        }
    }

 <template>
    <div>
        <div class="top-line">
            <div class="box-title">
                <span class="title">XXXX thematic map</span>
            </div>
        </div>
        <div class="scroll-box">
            <ul class="messages" @mouseover="stopAnim" @mouseout="runAnim" v-if="list.length"
                :style="{ animationDuration: animationDuration }" :class="{ stopPlay: animationPlayState }">
                <li class="message-item" v-for="(item, index) in list" :key="index" @click="toDetail(item)">
                    <div class="message-top">
                        <span class="message-title">{{ item.name }}</span>
                        <span class="message-time">{{ item.startDate }}</span>
                    </div>
                    <p class="message-content">{{ item.content }}</p>
                </li>
            </ul>
            <div class="none" v-else>
                No content yet</div>
        </div>
    </div>
</template>

 <script>
import test11List from '@/assets/test11List'
export default {
    data() {
        return {
            animationDuration: '',
            animationPlayState: false,
            list: test11List.list,
            category: ''
        };
    },
    mounted() {
        this.getData()
    },
    methods: {
        getData() {
            let data = this.list
            if (data.length <= 2) {
                this.animationPlayState = true
                this.animationDuration = 2 + 's'//Animation duration} else {
                // Marquee animation this.animationDuration = data.length * 2 + 's'
                this.list = this.list.concat(this.list)
            }
        },
        stopAnim() {//The mouse moves into the pause animation this.animationPlayState = true
        },
        runAnim() {//Mouse removal continues animation if (this.list.length > 2) {
                this.animationPlayState = false
            }
        }
    },
};
</script>

 <style lang="stylus" scoped>
    *{
        margin: 0
        padding: 0
    }
    ul{
        list-style: none
    }
    .scroll-box{
        width 100%
        height 800px
        overflow hidden
        border 2px solid red
    }
    .box-title
        line-height 34px
        font-size 16px
        background: blue
        color: #fff
        opacity 1
    .messages
        animation-name carousel
        animation-timing-function linear
        animation-iteration-count infinite
        .message-item
            cursor pointer
            margin-top 10px
        &.stopPlay
            animation-play-state paused
            /**
              The CSS3 animation-play-state property pauses the animation when it is paused and continues the animation when it is running*/
    .none
        text-align center
        line-height 537px
        color #fff
    @keyframes carousel {
        0% {
            transform: translateY(0%)
        }
        100% {
            transform: translateY(-50%)
        }
    }
</style>