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  2.1 ¶Ìʱ¼ä£¬ÐÎÈç (13:04:06)
¡¡¡¡¡¡¡¡function isTime(str)
      {
        var a = str.match(/^(\d{1,2})(:)?(\d{1,2})\2(\d{1,2})$/);
        if (a == null) {alert('ÊäÈëµÄ²ÎÊý²»ÊÇʱ¼ä¸ñʽ'); return false;}
        if (a[1]>24 || a[3]>60 || a[4]>60)
        {
          alert("ʱ¼ä¸ñʽ²»¶Ô");
          return false
        }
        return true;
      }
  2.2 ¶ÌÈÕÆÚ£¬ÐÎÈç (2003-12-05)
 function strDateTime(str)
      {
         var r = str.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);
         if(r==null)return false;
         var d= new Date(r[1], r[3]-1, r[4]);
         return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]);
      }
      ^(?:(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))(\/|-|\.)(?:0?2\1(?:29))$)|(?:(?:1[6-9]|[2-9]\d)?\d{2})(\/|-|\.)(?:(?:(?:0?[13578]|1[02])\2(?:31))|(?:(?:0?[1,3-9]|1[0-2])\2(29|30))|(?:(?:0?[1-9])|(?:1[0-2]))\2(?:0?[1-9]|1\d|2[0-8]))$
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