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js 根据天数算日期

时间:2014-10-08 11:51:15      阅读:247      评论:0      收藏:0      [点我收藏+]

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<!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 = 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

标签:http   io   ar   java   sp   c   on   cti   html   

原文地址:http://www.cnblogs.com/wangdi0827/p/4010625.html

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