vue3 ＜script setup＞ 语法糖时间组件

<template>
  <div>
    <p>当前时间Current Time: {{ currentTime }}</p>
  </div>
</template>

<script setup>
import { ref, onBeforeUnmount, onMounted } from 'vue'

const currentTime = ref('')

let interval // 声明 interval 变量

const getToday = () => {
  const datas = new Date()
  const on2 = ' : '
  let onS = datas.getHours()
  let onF = datas.getMinutes()
  let onN = datas.getSeconds()

  if (onS >= 0 && onS <= 9) {
    onS = '0' + onS
  }
  if (onF >= 0 && onF <= 9) {
    onF = '0' + onF
  }
  if (onN >= 0 && onN <= 9) {
    onN = '0' + onN
  }

  currentTime.value = onS + on2 + onF + on2 + onN
}

onMounted(() => {
  interval = setInterval(() => {
    // 将 interval 赋值为 setInterval 的返回值
    getToday()
  }, 1000)
})

onBeforeUnmount(() => {
  clearInterval(interval) // 使用 clearInterval 清除 interval 计时器
})
</script>
<style scoped>
p {
  font-size: 30px;
  color: hsla(160, 100%, 37%, 1);
    text-shadow: 1px 1px 1px rgb(0, 0, 0);
}
</style>