页面Header 公告消息组件

使用vue3实现

<template>
  <div ref="parentBoxRef" class="marquee-container">
    <span
      ref="contentRef"
      class="marquee-content marquee"
      :style="{ animationDuration: aniDuration }"
    >
      <span class="msg_item" v-for="(msg, ind) in messageList">
        {{ msg }}
      </span>
    </span>
  </div>
</template>

<script setup lang="ts">
import { ref, computed, onMounted } from 'vue'

interface MarqueeProps {
  message: string | string[]
  speed?: number
}
const props = defineProps<MarqueeProps>()
const messageList = computed(() => {
  if (typeof props.message === 'string') {
    return [props.message]
  } else {
    return props.message
  }
})
const contentRef = ref()
const parentBoxRef = ref()
const aniDuration = ref<string>('60s')
onMounted(() => {
  const width = contentRef.value.clientWidth
  const pWidth = parentBoxRef.value.clientWidth
  const minDuration = messageList.value.length * 10
  if (width && pWidth) {
    let duration = (width / pWidth) * 6
    if (duration < 10) {
      duration = 10
    }
    if(minDuration > duration){
      duration = minDuration
    }
    aniDuration.value = `${duration}s`
  }
})
</script>

<style scoped>
.msg_item {
  margin-left: 40px;
  &:nth-of-type(1) {
    margin-left: 0;
  }
}
.marquee-container {
  width: 100%;
  overflow: hidden;
  white-space: nowrap;
  box-sizing: border-box;
}

.marquee {
  display: inline-block;
  padding-left: 100%; /* 使文本从右侧开始 */
  animation: marquee 10s linear infinite;
  font-size: 14px;
  color: #212121;
}

@keyframes marquee {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-100%);
  }
}
/* .marquee-container {
  overflow: hidden;
  white-space: nowrap;
  position: relative;
}

.marquee-content {
  display: inline-block;
  white-space: nowrap;
  position: absolute;
  left: 100%;
} */
</style>