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test.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<script type="text/javascript" src="js/jquery-min.js"></script>
<style type="text/css">
</style>
</head>
<body>
<div id="start"></div>
<div id="now"></div>
<div id="nowADay"></div>
<script type="text/javascript">
(function () {
var start = document.getElementById('start');
var now = document.getElementById('now');
var nowADay = document.getElementById('nowADay');
var startDay = new Date(2020, 7, 1); // 2013,7,26 是开学时间，可以按格式改，月份从0开始
var startMs = startDay.getTime();
var startYear = startDay.getFullYear();
var startMonth = startDay.getMonth() + 1; //月份从0开始
var startDate = startDay.getDate();
var nowDay = new Date();
var nowMs = nowDay.getTime();
var nowYear = nowDay.getFullYear();
var nowMonth = nowDay.getMonth() + 1;
var nowDate = nowDay.getDate();
var startDays = parseInt(startMs / 86400000);
var nowDays = parseInt(nowMs / 86400000);
var totalDays = nowDays - startDays;
var week = parseInt(totalDays / 7);
var nowdate = totalDays % 7;
start.innerHTML = "开学时间：" + startYear + " 年 " + startMonth + " 月 " + startDate + "日";
now.innerHTML = "现在时间：" + nowYear + " 年 " + nowMonth + " 月 " + nowDate + "日";
nowADay.innerHTML = "第" + week + "周，星期" + nowdate;
})();
</script>
</body>
</html>