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方法：van-datetime-picker（type：datetime）和 van-picker结合实现。

<template><div class="datetimesec-picker"><van-datetime-pickerref="timePickerRef"type="datetime" //年月日时分v-model="currentDate":show-toolbar="false":visible-item-count="7"@confirm="onTimeConfirm"/><van-pickerclass="sec-picker":default-index="secondIdx":show-toolbar="false":visible-item-count="7":columns="Array(60).fill().map((_, i) => `0${i}`.slice(-2))" //秒@change="handleSecChange"/></div><div @click="toggleTimeConfirm"><span class="flex justify-center items-center fw-600 text-18px c-#fff">下一步</span></div>
</template><script setup>
import momentMini from 'moment-mini'const formData = reactive({startDate：momentMini(new Date()).subtract(1, 'day').format('YYYY-MM-DD HH:mm:ss'),
})
const timePickerRef = ref(null)
const currentDate = ref(new Date(new Date().getTime() - 1 * 24 * 60 * 60 * 1000),
) //默认往前1天
const secondIdx = ref(null) //默认秒数索引
const handleSecChange = (val, idx) => {secondIdx.value = idx
}watch(() => formData.startDate,nV => {secondIdx.value = Number(nV.slice(-2))},{ immediate: true },
)//点击‘下一步’
const toggleTimeConfirm= () => {//触发datetime-picker的confirm钩子timePickerRef.value.getPicker().confirm()
}
const onTimeConfirm= value => {formData.startDate= `${momentMini(new Date(value)).format('YYYY-MM-DD HH:mm:ss').slice(0, -2)}${addZero(secondIdx.value)}`
}// 一位数字前面补零
const addZero = (num) => {return num < 10 ? `0${num}` : num;
}
</script><style lang="scss" scoped>
.datetimesec-picker {display: flex;.van-picker:first-of-type {flex: 5;}.van-picker:last-of-type {flex: 1;}
}
</style>

参考文章：

van-datetimesec-picker - npm