本文转自 https://juejin.cn/post/6980259055038136327，如有侵权，请联系删除。

1、滚动条组件代码

<!-- 公告栏组件 -->
<template>
  <div class="notice-bar" @click="tipClick">
    <div class="notice-bar__icon">
      <img src="../assets/images/patient/homepage/tip.png">
    </div>
    <div ref="wrap" class="notice-bar__wrap">
      <div ref="content" class="notice-bar__content" :style="contentStyle">{{ text }}</div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'NoticeBar',
  props: {
    text: {
      type: String,
      default: ''
    },
    speed: {
      type: Number,
      default: 50
    },
    defaultWidth: {
      type: Number,
      default: 375
    }
  },
  data () {
    return {
      contentStyle: {
        transitionDuration: '0s',
        transform: 'translateX(0px)'
      },
      wrapWidth: 0,
      contentWidth: 0,
      time: 0,
      timer: null,
      convertSpeed: 1
    }
  },
  created () {},
  mounted () {
    if (this.text) {
      this.init()
    }
  },
  watch: {
    text (val) {
      this.init()
    }
  },
  methods: {
    init () {
      const _width = window.innerWidth
      this.convertSpeed = _width / this.defaultWidth * this.speed  // 根据分辨率转化成不同的速度
      this.wrapWidth = this.$refs.wrap.offsetWidth
      this.contentWidth = this.$refs.content.offsetWidth
      this.startAnimate()
      this.timer = setInterval(() => {
        this.startAnimate()
      }, this.time * 1000)
      this.$once('hook:beforeDestroy', () => {
        clearInterval(this.timer)
        this.timer = null
      })
    },
    startAnimate () {
      this.contentStyle.transitionDuration = '0s'
      this.contentStyle.transform = 'translateX(' + this.wrapWidth + 'px)'
      this.time = (this.wrapWidth + this.contentWidth) / this.convertSpeed
      setTimeout(() => {
        this.contentStyle.transitionDuration = this.time + 's'
        this.contentStyle.transform = 'translateX(-' + this.contentWidth + 'px)'
      }, 200)
    },
    tipClick () {
      this.$emit('click')
    }
  }
}
</script>
<style scoped lang='less'>
    .notice-bar {
      position: relative;
      width: 100%;
      .px2rem(height, 80);
      .px2rem(padding-left, 0);
      .px2rem(padding-right, 0);
      .px2rem(font-size, 28);
      font-family: PingFangSC-Regular, PingFang SC;
      font-weight: 400;
      color: #868DAA;
      display: flex;
      align-items: center;
      .notice-bar__icon {
        .px2rem(width, 56);
        .px2rem(height, 28);
        .px2rem(margin-right, 20);
        img {
          width: 100%;
        }
      }
      .notice-bar__wrap {
        position: relative;
        display: flex;
        flex: 1;
        height: 100%;
        align-items: center;
        overflow: hidden;
        .notice-bar__content {
          position: absolute;
          white-space: nowrap;
          transition-timing-function: linear;
        }
      }
    }
</style>

2、组件调用

<template>
	<div>
        ...
        <notice-bar v-if="notice" :text="notice" @click="openTip" />
        ...
    </div>		
</template>
<script>
	import NoticeBar from '@/components/NoticeBar'
    export default {
        components: {
            NoticeBar
        },
         data () {
            return {
      			notice: ''
            }
         },
        methods: {
            openTip () {}
		}
    }
</script>

3、效果图