VUE-设置内容自行滚动显示

<template>
  <div class="test-auto-scroll">
    <div class="scroll-content">
      <div style="height: 100%; padding: 0 20px;">
        <template v-for="round in [0, 1]">
          <template class="event-block" v-for="(detail, idx) in dataList">
            <template v-if="round ? (idx < beginIdx) : (idx >= beginIdx)">
              <div class="event-block" :key="round + '-' + idx">
                <span>{{ detail.value }}</span>
              </div>
            </template>
          </template>
        </template>
      </div>
    </div>
  </div>
</template>

<script>

export default {
  data () {
    return {
      data: [{
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }, {
        value: '测试自动滚动的数据——2020-01-19 02:03:44'
      }]
      beginIdx: 0
    }
  },
  computed: {
    dataList () {
      this.$nextTick(() => {
        this.scrollView()
      })
      if (!this.data) return []
      return this.data
    }
  },
  mounted () {
    this.scrollView()
  },
  beforeDestroy () {
    this.clearInterval()
  },
  methods: {
    scrollUp () {
      let beginIdx = this.beginIdx + 1
      this.beginIdx = (beginIdx % this.dataList.length)
    },
    scrollView () {
      this.clearInterval()
      this.box = document.querySelector('.today-overview')
      this.content = document.querySelector('.today-overview .scroll-content')
      if (this.content.clientHeight <= this.box.clientHeight) return // 无需滚动
      this.scrollInterval = setInterval(this.scrollUp, 2000)
    },
    clearInterval () {
      if (this.scrollInterval) {
        this.beginIdx = 0
        clearInterval(this.scrollInterval)
        this.scrollInterval = null
      }
    }
  }
}
</script>
<style lang="scss" scoped>
.test-auto-scroll {
  position: relative;
  overflow: hidden;
  height: calc(100% - 12px);

  .event-block {
    text-indent: 2em;
    font-size: 12px;
    color: #FFFFFF;
    letter-spacing: 0;
    text-align: justify;
    word-break: break-all;
    padding: 5px 0;
    border-bottom: 1px solid #173279;
  }
  
}
</style>