VUE3 開発の基本: Vue.js プラグインを使用してカウントダウン コンポーネントをカプセル化する

<template>
  <div class="countdown">
    <span>{{ formatCountDownTime }}</span>
  </div>
</template>

<script>
import { ref, onMounted, onUnmounted } from 'vue';

export default {
  name: 'CountDown',
  props: {
    endTime: {
      type: String,
      required: true
    }
  },
  setup(props) {
    const countDownTime = ref('00:00:00');

    // 计算倒计时时间
    const calcCountDownTime = () => {
      const diff = Date.parse(props.endTime) - Date.parse(new Date());
      const seconds = Math.floor(diff / 1000);
      if (seconds <= 0) {
        countDownTime.value = '00:00:00';
        clearInterval(intervalId);
      } else {
        const hours = Math.floor(seconds / 3600);
        const minutes = Math.floor((seconds - hours * 3600) / 60);
        const leftSeconds = seconds - hours * 3600 - minutes * 60;
        countDownTime.value = `${formatTime(hours)}:${formatTime(minutes)}:${formatTime(leftSeconds)}`;
      }
    };
    
    // 格式化时间
    const formatTime = (time) => {
      return time < 10 ? `0${time}` : time;
    }

    let intervalId;

    onMounted(() => {
      calcCountDownTime();
      intervalId = setInterval(() => {
        calcCountDownTime();
      }, 1000);
    });

    onUnmounted(() => {
      clearInterval(intervalId);
    });

    return {
      countDownTime,
      formatCountDownTime: ref('00:00:00')
    };
  }
};
</script>

<style>
.countdown {
  font-size: 18px;
  font-weight: bold;
}
</style>

import CountDown from '@/components/CountDown.vue';

const CountdownPlugin = {
  install(app) {
    app.component(CountDown.name, CountDown);
  }
};

export default CountdownPlugin;

<template>
  <div class="home">
    <CountDown :endTime="endTime" />
  </div>
</template>

<script>
import { ref } from 'vue';
import CountdownPlugin from '@/plugins/countdown.js';

export default {
  name: 'Home',
  setup() {
    const endTime = ref('2021-10-30 00:00:00');

    return {
      endTime
    };
  },
  mounted() {
    Vue.use(CountdownPlugin);
  }
};
</script>

<style>

</style>