根据天数算日期

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<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>
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posted on 2014-10-08 10:31 Seven、阅读(469) 评论(0) 编辑收藏举报