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我正在尝试在我的页面上显示上次登录日期和时间。我能够做到，但问题是每次刷新或重新加载页面时，这次都会更改为刷新/重新加载的时间。我想在第一次登录时保持相同的登录时间而不改变页面刷新或类似的东西这是我的代码

var days = 730;
  var lastvisit=new Object();
  var firstvisitmsg=" Welcome!";
  lastvisit.subsequentvisitmsg="Last Login: <b>[displaydate]</b>";

  lastvisit.getCookie=function(Name){
  var re=new RegExp(Name+"=[^;]+", "i");
  if (document.cookie.match(re))
  return document.cookie.match(re)[0].split("=")[1];
  return'';
  }

  lastvisit.setCookie=function(name, value, days){
  var expireDate = new Date();

  var expstring=expireDate.setDate(expireDate.getDate()+parseInt(days));
  document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
  }

  lastvisit.showmessage = function() {
  var wh = new Date();
  if (lastvisit.getCookie("visitc") == "") {
  lastvisit.setCookie("visitc", wh, days);
  document.write(firstvisitmsg);
  }

  else {
  var lv = lastvisit.getCookie("visitc");
  var lvp = Date.parse(lv);
  var now = new Date();
  now.setTime(lvp);
  var day = new Array("Sun", "Mon", "Tues", "Wed", "Thur", "Fri", "Sat");
  var month = new Array ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
  var dd = now.getDate();
  var dy = now.getDay();
  dy = day[dy];
  var mn = now.getMonth();
  mn = month[mn];
  yy = now.getFullYear();
  var hh = now.getHours();
  var ampm = "AM";
  if (hh >= 12) {ampm = "PM"}
  if (hh >12){hh = hh - 12};
  if (hh == 0) {hh = 12}
  if (hh < 10) {hh = "0" + hh};
  var mins = now.getMinutes();
  if (mins < 10) {mins = "0"+ mins}
  var secs = now.getSeconds();
  if (secs < 10) {secs = "0" + secs}
  var dispDate = dy + ", " + mn + " " + dd + ", " + yy + " " + hh + ":" + mins + ":" + secs + " " + ampm
  var lastlogin = lastvisit.subsequentvisitmsg.replace("\[displaydate\]", dispDate);
  document.write(lastlogin);
  }

  lastvisit.setCookie("visitc", wh, days);

  }

<div id="lastcontent" style="margin-top:-30px;margin-left:30px;font-size:72%"><script>lastvisit.showmessage();</script></div>
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