创建组件文件marquee.vue

<template>
    <div class="scrollText" ref="outer">
        <div class="st-inner" :class="{'st-scrolling': needToScroll}">
            <span class="st-section" ref="inner">{{text}}</span>
            <span class="st-section" v-if="needToScroll">{{text}}</span>
            <!-- 加两条是为了滚动的时候实现无缝衔接 -->
        </div>
    </div>
</template>
<script>
export default {
  data () {
    return {
      needToScroll: false,
      text: ''
    }
  },
  mounted () {
    this.startCheck()
  },
  beforeDestroy () {
    this.stopCheck()
  },
  methods: {
    // 检查当前元素是否需要滚动
    check () {
      this.setText()
      this.$nextTick(() => {
        let flag = this.isOverflow()
        this.needToScroll = flag
      })
    },

    // 判断子元素宽度是否大于父元素宽度，超出则需要滚动，否则不滚动
    isOverflow () {
      let outer = this.$refs.outer
      let inner = this.$refs.inner
      let outerWidth = this.getWidth(outer)
      let innerWidth = this.getWidth(inner)
      return innerWidth > outerWidth
    },

    // 获取元素宽度
    getWidth (el) {
      let { width } = el.getBoundingClientRect()
      return width
    },

    // 获取到父组件传过来的内容复传给this.text
    setText () {
      this.text =
        (this.$slots.default &&
          this.$slots.default.reduce((res, it) => res + it.text, '')) ||
        ''
    },

    // 增加定时器，隔一秒check一次
    startCheck () {
      this._checkTimer = setInterval(this.check, 1000)
      this.check()
    },

    // 关闭定时器
    stopCheck () {
      clearInterval(this._checkTimer)
    }
  }
}
</script>
<style lang="scss" scoped>
.scrollText {
  overflow: hidden;
  white-space: nowrap;
}
.st-inner {
  display: inline-block;
}
.st-scrolling .st-section {
  padding: 0 5px;
}

// 向左匀速滚动动画
.st-scrolling {
  animation: scroll 10s linear infinite;
}

@keyframes scroll {
  0% {
    transform: translate3d(0%, 0, 0);
  }
  100% {
    transform: translate3d(-50%, 0, 0);
  }
}
</style>

在页面中引用

<template>
  <div class="scroll_box">
    <marquee> 我是一条文字走马灯文字走马灯文字走马灯文字走马灯文字走马灯文字走马灯 </marquee>
  </div>
</template>

<script>
import marquee from '@/components/Marquee/marquee'
export default {
  components: {
    marquee
  },
  data () { 
    return {}
  }
}
</script>

<style scoped>
  .scroll_box{
     width:100px; 
  }
</style>

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