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  • javascript实现日期按月份加减

    原文:https://www.jb51.net/article/66132.htm

    <!DOCTYPE html>
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
      <meta charset="utf-8">
      <title></title>
      <script>
        function dateToDate(date) {
          var sDate = new Date();
          if (typeof date == 'object'
            && typeof new Date().getMonth == "function"
            ) {
            sDate = date;
          }
          else if (typeof date == "string") {
            var arr = date.split('-')
            if (arr.length == 3) {
              sDate = new Date(arr[0] + '-' + arr[1] + '-' + arr[2]);
            }
          }
    
          return sDate;
        }
    
    
        function addMonth(date, num) {
          num = parseInt(num);
          var sDate = dateToDate(date);
    
          var sYear = sDate.getFullYear();
          var sMonth = sDate.getMonth() + 1;
          var sDay = sDate.getDate();
    
          var eYear = sYear;
          var eMonth = sMonth + num;
          var eDay = sDay;
          while (eMonth > 12) {
            eYear++;
            eMonth -= 12;
          }
    
          var eDate = new Date(eYear, eMonth - 1, eDay);
    
          while (eDate.getMonth() != eMonth - 1) {
            eDay--;
            eDate = new Date(eYear, eMonth - 1, eDay);
          }
    
          return eDate;
        }
    
        function calcDate() {
          var d = document.getElementById('date').value;
          var n = document.getElementById('num').value;
          var eDate = addMonth(d, n);
          document.getElementById('result').innerHTML = eDate.getFullYear() + '-' + (eDate.getMonth() + 1) + '-' + eDate.getDate();
        }
      </script>
    </head>
    <body>
      <input type="date" id="date" />
      <input type="number" id="num" value="1" />
      <input type="button" value="计算" onclick="calcDate()" />
      <div id="result"></div>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/zhang1f/p/13936819.html
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