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js 根据天数算日期
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1250">
<meta name="generator" content="PSPad editor, www.pspad.com">
<title></title>
</head>
<body>
<script type="text/javascript">
alert(showDate(20));
function showDate(calValue) {
var dateObj = new Date();
var curYear = dateObj.getFullYear();
var curMonth = dateObj.getMonth() + 1;
var curDate = dateObj.getDate();
curMonth = curMonth > 9 ? curMonth : "0" + curMonth;
curDate = curDate > 9 ? curDate : "0" + curDate;
var dateParameter = curYear + "/" + curMonth + "/" + curDate;
var returnDate = "";
returnDate = calculateDate(dateParameter, calValue);
return returnDate;
}
function calculateDate(dateParameter, calValue) {
var calValue = http://www.mamicode.com/Number(calValue);
var newDate = new Date(dateParameter);
//返回日期的毫秒值
newDate = newDate.valueOf();
//加/减天数后的毫秒值
newDate = newDate + calValue * 24 * 60 * 60 * 1000;
newDate = new Date(newDate);
//如果月份长度少于2，则前加 0 补位
var month = newDate.getMonth()+1;
var month = month > 9 ? month : "0" + month;
//如果天数长度少于2，则前加 0 补位
var date = newDate.getDate();
var date = date > 9 ? date : "0" + date;
var returnDate = newDate.getFullYear() + "-" + month + "-" + date;
return returnDate;
}
</script>
</body>
</html>
js 根据天数算日期