<!--
* @FilePath: 促销日期
* @Author: 马小屁
* @Date: 2022-08-19 20:05:49
* @LastEditors: Please set LastEditors
* @LastEditTime: 2022-08-20 16:41:52
* Copyright: 2022 xxxTech CO.,LTD. All Rights Reserved.
* @Description:
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
//生产日期
var scDate = new Date(prompt('请输入生产日期，输入格式为yyyy-MM-DD'));
// 保质期天数的毫秒数
var bzSeconds = prompt('请输入保质期天数') * 1000 * 24 * 60 * 60;
//过期日日期的毫秒数
var overSeconds = scDate.getTime() + bzSeconds;
//过期日前两周日期的毫秒数
var beforeWeekSeconds = overSeconds - 14 * 1000 * 60 * 60 * 24;
// 过期日前两周日期
var time = new Date(beforeWeekSeconds);
//过期日前两日期当天星期几
var week = time.getDay();
//促销日
var promotionDay;
switch (week) {
case 0:
promotionDay = new Date(beforeWeekSeconds + 3 * 1000 * 60 * 60 * 24)
break;
case 1:
promotionDay = new Date(beforeWeekSeconds + 2 * 1000 * 60 * 60 * 24)
break;
case 2:
promotionDay = new Date(beforeWeekSeconds + 1 * 1000 * 60 * 60 * 24)
break;
case 3:
promotionDay = time
break;
case 4:
promotionDay = new Date(beforeWeekSeconds + 6 * 1000 * 60 * 60 * 24)
break;
case 5:
promotionDay = new Date(beforeWeekSeconds + 5 * 1000 * 60 * 60 * 24)
break;
case 6:
promotionDay = new Date(beforeWeekSeconds + 4 * 1000 * 60 * 60 * 24)
break;
}
alert(`促销日为${promotionDay.toLocaleDateString()}`);
</script>
</body>
</html>
标签：24,beforeWeekSeconds,促销,60,日期,promotionDay,Date,new,输入 From： https://www.cnblogs.com/maxiaopi/p/16608506.html