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<script src="https://cdn.bootcss.com/dayjs/1.8.14/dayjs.min.js"></script>
<script type="text/javascript">
var day = (new Date('2019-12-31') - new Date()) / (24 * 60 * 60 * 1000);
var str = dayjs().format('今天是YYYY年MM月DD日<br/>');
str += "距2019年12月31日还有还有" + Math.floor(day) + "天!";
document.write(str);
</script>
<style>
#result{border:2px solid #1B2A0B;background:#92D14F;display:inline-block;padding:2px 60px 8px;text-align:center;}
#result p{margin:0;padding:2px 0;}
</style>
<div id="result"></div>
<script>
let today = new Date(),
todayMS = today.getTime(),
targetMS = new Date("2019-12-31").getTime(),
leftMS = targetMS - todayMS,
leftDays = Math.max(0,Math.ceil(leftMS/1000/60/60/24)),
todayYear = today.getFullYear(),
todayMonth = today.getMonth() + 1,
todayDay = today.getDate();
document.getElementById('result').innerHTML =
`
<p>今天是${todayYear}年${todayMonth}月${todayDay}日</p>
<p>距2019年12月31日还有还有${leftDays} 天!</p>
`;
</script>
<div id="result"></div>
<script>
let today = new Date(),
todayMS = today.getTime(),
targetMS = new Date("2019-12-31").getTime(),
leftMS = targetMS - todayMS,
leftDays = Math.max(0,Math.ceil(leftMS/1000/60/60/24)),
todayYear = today.getFullYear(),
todayMonth = today.getMonth() + 1,
todayDay = today.getDate();
document.getElementById('result').innerHTML =
`
<p>今天是${todayYear}年${todayMonth}月${todayDay}日</p>
<p>距2019年12月31日还有还有${leftDays} 天!</p>
`;
</script>
<div id="result"></div>
<script>
let today = new Date(),
todayMS = today.getTime(),
targetMS = new Date("2019-12-31").getTime(),
leftMS = targetMS - todayMS,
leftDays = Math.max(0,Math.ceil(leftMS/1000/60/60/24)),
todayYear = today.getFullYear(),
todayMonth = today.getMonth() + 1,
todayDay = today.getDay();
document.getElementById('result').innerHTML =
`
<p>今天是${todayYear}年${todayMonth}月${todayDay}日</p>
<p>距2019年12月31日还有还有${leftDays} 天!</p>
`;
</script>