import dayjs from 'dayjs'
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/**
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* 实时时钟 composable，每秒更新当前时间
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* @returns now - 格式化的当前时间字符串（YYYY-MM-DD HH:mm:ss）
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*/
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export const useClock = () => {
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const now = ref(dayjs().format('YYYY-MM-DD HH:mm:ss'))
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let timer: ReturnType<typeof setInterval> | null = null
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onMounted(() => {
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timer = setInterval(() => {
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now.value = dayjs().format('YYYY-MM-DD HH:mm:ss')
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}, 1000)
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})
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onUnmounted(() => {
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if (timer) {
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clearInterval(timer)
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timer = null
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}
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})
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return { now }
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}
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