vue2和vue3两种倒计时CountDown实现

一、vue2

1.CountDown.vue 

<template>
  <span style="color: red;font-weight: 500;font-size: 16px;" :endTime="endTime">
  <slot>
  {{ content }}
  </slot>
  </span>
</template>
<script>
export default {
  data() {
    return {
      content: '',
      timer: null,
    }
  },
  props: {
    endTime: {
      type: String,
      default: ''
    },
  },
  watch: {
    endTime() {
      this.countdown(this.endTime)
    }
  },
  beforeUnmount() {
    if (this.timer) {
      clearInterval(this.timer);
    }
  },
  mounted() {
    this.countdown(this.endTime)
  },
  methods: {
    countdown(timestamp) {
      let self = this;
      if (self.timer) {
        clearInterval(self.timer);
      }
      this.timer = setInterval(function () {
        let nowTime = new Date();
        if (!timestamp || timestamp.length == 0) {
          return
        }
        let endTime = new Date(timestamp * 1000);
        let t = endTime.getTime() - nowTime.getTime();
        if (t > 0) {
          let day = Math.floor(t / 86400000);
          let hour = Math.floor((t / 3600000) % 24);
          let min = Math.floor((t / 60000) % 60);
          let sec = Math.floor((t / 1000) % 60);
          let format = '';
          if (day > 0) {
            format = `${day}天${hour}小时${min}分${sec}秒`;
          }
          if (day <= 0 && hour > 0) {
            format = `${hour}小时${min}分${sec}秒`;
          }
          if (day <= 0 && hour <= 0) {
            format = `${min}分${sec}秒`;
          }
          self.content = format;
        } else {
          clearInterval(self.timer);
          self.$emit('timeout')
        }
      }, 1000);
    }
  }
}
</script>

2.效果

二、vue3

1.安装

npm install vue3-countdown --save

2.使用

<template>
 <countdown :time="remainTime" format="HH:mm:ss">
      <template #="{ resolved }">
            <span class="countdown-item">{{ resolved.HH }}</span><span
                      class="timeColon">:</span>
            <span class="countdown-item">{{ resolved.mm }}</span><span
                      class="timeColon">:</span>
            <span class="countdown-item">{{ resolved.ss }}</span>
      </template>
 </countdown>
</template>
<script lang="ts" setup>
import Countdown from 'vue3-countdown'

const remainTime = ref<number>();
onMounted(()=>{
    let nowTime = new Date();
    let endTime = new Date(limitTime);// limitTime为传入的时间
    remainTime.value = endTime.getTime() - nowTime.getTime();
})
</script>

<style scoped>
.countdown-item {
  padding: 3px 6px;
  border-radius: 3px;
  color: #fff;
  font-size: 16px;
  background-color: #c00;
}

.timeColon {
  color: #FFF;
  font-weight: 500;
  font-size: 16px;
  margin: 0 5px;
}
</style>

3.效果