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<title>Document</title>
<script src="./js/jquery-3.6.0.js"></script>
<script>
$(function () {
setInterval(function () {
var now = new Date();
var workerDay = new Date("2021-5-1 00:00:00");
var second = (workerDay.getTime() - now.getTime()) / 1000;
var day = parseInt(second / (60 * 60 * 24));
second -= day * 60 * 60 * 24;
var hour = parseInt(second / (60 * 60));
second -= hour * 60 * 60;
var minute = parseInt(second / 60);
second -= minute * 60;
var restTime = "距离五一劳动节还有" + day + "天"
+ hour + "小时" + minute + "分" + parseInt(second) + "秒";
$("#restTime").text(restTime);
}, 1000)
})
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<body>
<h2 id="restTime"></h2>
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