WangShuXian6/index.html

## index.html
<!DOCTYPE html>
<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>data</title>
    <style>
        .date-container {
            opacity: 0;
            z-index: -1;
            position: fixed;
            top: 100vh;
            left: 0;
            width: 100vw;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease-in-out;
            background-color: rgba(0, 0, 0, 0.2);
        }

        .date-container.show {
            opacity: 1;
            z-index: 1;
            position: fixed;
            top: 0vh;
            left: 0;
            width: 100vw;
            height: 100vh;
            transition: all 0.2s ease-in-out;
        }

        .date-container .main {
            position: relative;
            display: flex;
            width: 52vw;
            height: 9.33vw;
        }

        .date-container .main .bg {
            position: relative;
            display: flex;
            width: 52vw;
            height: 9.33vw;
        }

        .date-container .main .month {
            position: absolute;
            top: 0px;
            left: 5vw;
            display: flex;

        }

        .date-container .main .day {
            position: absolute;
            top: 0px;
            left: 28vw;
            display: flex;

        }

        select {
            /* background: rgba(255, 255, 255, 0.2); */
            background: rgba(255, 255, 255, 0);
            /* color: rgba(255, 255, 255, 0.5); */
            color: #fff;
            border: none;
            width: 50px;
            height: 25px;
            border-radius: 2px;
            text-align: center;
            margin: 5px;
        }

        select option {
            color: gray;
        }
    </style>
</head>

<body>
    <div class="date-container">
        <div class='main'>
            <img src="./time.png" alt="time" class='bg'>

            <select class="month">
                <option value="1">1</option>
            </select>

            <select class="day">
                <option value="1">1</option>
            </select>
        </div>
    </div>
    <script>
        let month // 选中的月份
        let day // 选中的日期
        const monthDom = document.querySelector('.month')
        const dayDom = document.querySelector('.day')
        const dateDom = document.querySelector('.date-container')
        const showDateSelect = () => {
            dateDom.classList.add('show')
        }

        const hideDateSelect = () => {
            dateDom.classList.remove('show')
        }

        const monthEvent = () => {
            console.log('month', monthDom.value)
            month = parseInt(monthDom.value)
            const days = new Date(2019, month, 0).getDate()
            initDay(days)
        }

        const dayEvent = () => {
            console.log('day', dayDom.value)
            day = parseInt(dayDom.value)
        }

        const initMonth = () => {
            let optionsString = ``
            const months = Array.from(Array(12).keys())
            const monthOptions = months.forEach((item) => {
                optionsString += `<option value="${item + 1}">${item + 1}</option>`
            })
            monthDom.innerHTML = optionsString
        }

        const initDay = (days) => {
            let optionsString = ``
            const months = Array.from(Array(days).keys())
            const monthOptions = months.forEach((item) => {
                optionsString += `<option value="${item + 1}">${item + 1}</option>`
            })
            dayDom.innerHTML = optionsString
        }

        initMonth()
        initDay(31)

        monthDom.addEventListener('change', monthEvent)
        dayDom.addEventListener('change', dayEvent)

        setTimeout(() => {
            showDateSelect()
        }, 2000)

        setTimeout(() => {
            hideDateSelect()
        }, 5000)
    </script>
</body>

</html>
	<!DOCTYPE html>
	<html lang="zh-cn">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>data</title>
	<style>
	.date-container {
	opacity: 0;
	z-index: -1;
	position: fixed;
	top: 100vh;
	left: 0;
	width: 100vw;
	height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: all 0.2s ease-in-out;
	background-color: rgba(0, 0, 0, 0.2);
	}

	.date-container.show {
	opacity: 1;
	z-index: 1;
	position: fixed;
	top: 0vh;
	left: 0;
	width: 100vw;
	height: 100vh;
	transition: all 0.2s ease-in-out;
	}

	.date-container .main {
	position: relative;
	display: flex;
	width: 52vw;
	height: 9.33vw;
	}

	.date-container .main .bg {
	position: relative;
	display: flex;
	width: 52vw;
	height: 9.33vw;
	}

	.date-container .main .month {
	position: absolute;
	top: 0px;
	left: 5vw;
	display: flex;

	}

	.date-container .main .day {
	position: absolute;
	top: 0px;
	left: 28vw;
	display: flex;

	}

	select {
	/* background: rgba(255, 255, 255, 0.2); */
	background: rgba(255, 255, 255, 0);
	/* color: rgba(255, 255, 255, 0.5); */
	color: #fff;
	border: none;
	width: 50px;
	height: 25px;
	border-radius: 2px;
	text-align: center;
	margin: 5px;
	}

	select option {
	color: gray;
	}
	</style>
	</head>

	<body>
	<div class="date-container">
	<div class='main'>
	<img src="./time.png" alt="time" class='bg'>

	<select class="month">
	<option value="1">1</option>
	</select>

	<select class="day">
	<option value="1">1</option>
	</select>
	</div>
	</div>
	<script>
	let month // 选中的月份
	let day // 选中的日期
	const monthDom = document.querySelector('.month')
	const dayDom = document.querySelector('.day')
	const dateDom = document.querySelector('.date-container')
	const showDateSelect = () => {
	dateDom.classList.add('show')
	}

	const hideDateSelect = () => {
	dateDom.classList.remove('show')
	}

	const monthEvent = () => {
	console.log('month', monthDom.value)
	month = parseInt(monthDom.value)
	const days = new Date(2019, month, 0).getDate()
	initDay(days)
	}

	const dayEvent = () => {
	console.log('day', dayDom.value)
	day = parseInt(dayDom.value)
	}

	const initMonth = () => {
	let optionsString = ``
	const months = Array.from(Array(12).keys())
	const monthOptions = months.forEach((item) => {
	optionsString += `<option value="${item + 1}">${item + 1}</option>`
	})
	monthDom.innerHTML = optionsString
	}

	const initDay = (days) => {
	let optionsString = ``
	const months = Array.from(Array(days).keys())
	const monthOptions = months.forEach((item) => {
	optionsString += `<option value="${item + 1}">${item + 1}</option>`
	})
	dayDom.innerHTML = optionsString
	}

	initMonth()
	initDay(31)

	monthDom.addEventListener('change', monthEvent)
	dayDom.addEventListener('change', dayEvent)

	setTimeout(() => {
	showDateSelect()
	}, 2000)

	setTimeout(() => {
	hideDateSelect()
	}, 5000)
	</script>
	</body>

	</html>