Question

我想倒数从今天到特定时间的剩余时间。但是当我刷新浏览器时，它从启动开始。我无法解决这个问题。这是我的源代码：

function getTimeRemaining(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 initializeClock(id, endtime) {
  var clock = document.getElementById(id);
  var daysSpan = clock.querySelector('.days');
  var hoursSpan = clock.querySelector('.hours');
  var minutesSpan = clock.querySelector('.minutes');
  var secondsSpan = clock.querySelector('.seconds');

  function updateClock() {
    var t = getTimeRemaining(endtime);

    daysSpan.innerHTML = t.days;
    hoursSpan.innerHTML = ('0' + t.hours).slice(-2);
    minutesSpan.innerHTML = ('0' + t.minutes).slice(-2);
    secondsSpan.innerHTML = ('0' + t.seconds).slice(-2);

    if (t.total <= 0) {
      clearInterval(timeinterval);
    }
  }

  updateClock();
  var timeinterval = setInterval(updateClock, 1000);
}

var deadline = new Date(Date.parse(new Date()) + 20 * 24 * 60 * 60 * 1000);
initializeClock('test', deadline);

Answer 1

您需要保留剩余时间，以便在用户关闭页面后返回时可以使用时间。有几种方法可以做到这一点（cookie等），但最简单的方法是使用 localStorage

这将在您的getTimeRemaining函数中使用，如下所示：

function getTimeRemaining(endtime) {

  // Check to see if there is a previous time already stored in localStorage
  if(localStorage.getItem('timeRemaining')){

     // There is, use that:
     return JSON.parse(localStorage.getItem('timeRemaining'));
  }

  // If not, generate the correct time remaining:

  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));

  // Turn answer into a string:
  var timeRemaining = JSON.stringify({
    'total': t,
    'days': days,
    'hours': hours,
    'minutes': minutes,
    'seconds': seconds
  });

  // Store data in localStorage:
  localStorage.setItem('timeRemaining', timeRemaining);

  return timeRemaining;
}

每次刷新浏览器时如何修复计时功能？

1 个答案: