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我需要使用 JS 创建一个“截止日期”选项（倒计时）。我希望用户能够从 html 中的日期弹出窗口对其进行配置，并且当用户刷新页面时，倒计时仍在用户配置的日期上工作。我还需要让用户能够配置截止日期发生的事件名称。

注意：我试过这个$("#scheduleDate").datepicker().val();但它不起作用，因为它在页面加载时直接运行，而且它也不是永久性的（重新加载时，它的值会消失）。这是我的代码：

//Get the date from user's input
function getParameterByName(name) {
  name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
  var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
    results = regex.exec(location.search);
  return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}

//the event_title
var title = getParameterByName('event_title');
document.getElementById("event_title").innerHTML = title;

//the countdown
var deadline = getParameterByName('deadline');

function time_remaining(endtime) {
  var t = Date.parse(endtime) - Date.parse(new Date());
  var seconds = Math.floor((t / 1000) % 60);
  var minutes = Math.floor((t / 1000 / 60) % 60);
  var hours = Math.floor((t / (1000 * 60 * 60)) % 24);
  var days = Math.floor(t / (1000 * 60 * 60 * 24));
  return {
    'total': t,
    'days': days,
    'hours': hours,
    'minutes': minutes,
    'seconds': seconds
  };
}

function run_clock(id, endtime) {
  var clock = document.getElementById(id);

  // get spans where our clock numbers are held
  var days_span = clock.querySelector('.days');
  var hours_span = clock.querySelector('.hours');
  var minutes_span = clock.querySelector('.minutes');
  var seconds_span = clock.querySelector('.seconds');

  function update_clock() {
    var t = time_remaining(endtime);

    // update the numbers in each part of the clock
    days_span.innerHTML = t.days;
    hours_span.innerHTML = ('0' + t.hours).slice(-2);
    minutes_span.innerHTML = ('0' + t.minutes).slice(-2);
    seconds_span.innerHTML = ('0' + t.seconds).slice(-2);

    if (t.total <= 0) {
      clearInterval(timeinterval);
    }
  }
  update_clock();
  var timeinterval = setInterval(update_clock, 1000);
}
run_clock('clockdiv', deadline);
body {
  text-align: center;
  background: #00ECB9;
  font-family: sans-serif;
  font-weight: 100;
}

h1 {
  color: #396;
  font-weight: 100;
  font-size: 40px;
  margin: 40px 0px 20px;
}

.link {
  margin-top: 40px;
}

a {
  display: inline-block;
  color: #fff;
  font-size: 20px;
  padding: 20px;
  background: #265;
  border-radius: 10px;
  text-decoration: none;
}

a:hover {
  background: #487;
}

#clockdiv {
  font-family: sans-serif;
  color: #fff;
  display: inline-block;
  font-weight: 100;
  text-align: center;
  font-size: 30px;
}

#clockdiv>div {
  padding: 10px;
  border-radius: 3px;
  background: #00BF96;
  display: inline-block;
}

#clockdiv div>span {
  padding: 15px;
  border-radius: 3px;
  background: #00816A;
  display: inline-block;
}

.smalltext {
  padding-top: 5px;
  font-size: 16px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<p id="demo88"> The Upcoming CTF</p>

<form method="GET">
  <input type="date" name="deadline" value="" />
  <input type="text" name="event_title" value="" placeholder="Enter Event Title" />
  <input type="submit" />
</form>


</div>
<div id="clockdiv">
  <div><span class="days"></span>
    <div class="smalltext">Days</div>
  </div>
  <div><span class="hours"></span>
    <div class="smalltext">Hours</div>
  </div>
  <div><span class="minutes"></span>
    <div class="smalltext">Minutes</div>
  </div>
  <div><span class="seconds"></span>
    <div class="smalltext">Seconds</div>
  </div>
</div>

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