Question

我的网站上有以下代码行：

HTML

<div class="qa">
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>Last</div>
</div>

<p class="countdown-timer">00:01:00</p>

的JavaScript / jQuery的

$(document).ready(function() {
  $('.qa').slick({
    infinite: false,
    slidesToShow: 1,
    slidesToScroll: 1,
    adaptiveHeight: false,
    arrows: true,
    mobileFirst: true,
    respondTo: 'window',
    useCSS: true,
    swipeToSlide: false
  });
});

function Stopwatch(config) {
  // If no config is passed, create an empty set
  config = config || {};
  // Set the options (passed or default)
  this.element = config.element || {};
  this.previousTime = config.previousTime || new Date().getTime();
  this.paused = config.paused && true;
  this.elapsed = config.elapsed || 0;
  this.countingUp = config.countingUp && true;
  this.timeLimit = config.timeLimit || (this.countingUp ? 60 * 10 : 0);
  this.updateRate = config.updateRate || 100;
  this.onTimeUp = config.onTimeUp || function() {
    this.stop();
  };
  this.onTimeUpdate = config.onTimeUpdate || function() {
    console.log(this.elapsed)
  };
  if (!this.paused) {
    this.start();
  }
}

Stopwatch.prototype.start = function() {
  // Unlock the timer
  this.paused = false;
  // Update the current time
  this.previousTime = new Date().getTime();
  // Launch the counter
  this.keepCounting();
};

Stopwatch.prototype.keepCounting = function() {
  // Lock the timer if paused
  if (this.paused) {
    return true;
  }
  // Get the current time
  var now = new Date().getTime();
  // Calculate the time difference from last check and add/substract it to 'elapsed'
  var diff = (now - this.previousTime);
  if (!this.countingUp) {
    diff = -diff;
  }
  this.elapsed = this.elapsed + diff;
  // Update the time
  this.previousTime = now;
  // Execute the callback for the update
  this.onTimeUpdate();
  // If we hit the time limit, stop and execute the callback for time up
  if ((this.elapsed >= this.timeLimit && this.countingUp) || (this.elapsed <= this.timeLimit && !this.countingUp)) {
    this.stop();
    this.onTimeUp();
    return true;
  }
  // Execute that again in 'updateRate' milliseconds
  var that = this;
  setTimeout(function() {
    that.keepCounting();
  }, this.updateRate);
};

Stopwatch.prototype.stop = function() {
  // Change the status
  this.paused = true;
};

$(document).ready(function() {
  /*
   * First example, producing 2 identical counters (counting down)
   */
  $('.countdown-timer').each(function() {
    var stopwatch = new Stopwatch({
      'element': $(this),               // DOM element
      'paused': false,                  // Status
      'elapsed': 1000 * 60 * 1,         // Current time in milliseconds
      'countingUp': false,              // Counting up or down
      'timeLimit': 0,                   // Time limit in milliseconds
      'updateRate': 100,                // Update rate, in milliseconds
      'onTimeUp': function() {          // onTimeUp callback
            this.stop();
            $(this.element).html('Times Up');

            $(".qa").slick('slickGoTo', $('.qa div').length);    
      },
      'onTimeUpdate': function() {      // onTimeUpdate callback
        var t = this.elapsed,
            h = ('0' + Math.floor(t / 3600000)).slice(-2),
            m = ('0' + Math.floor(t % 3600000 / 60000)).slice(-2),
            s = ('0' + Math.floor(t % 60000 / 1000)).slice(-2);
        var formattedTime = h + ':' + m + ':' + s;
        $(this.element).html(formattedTime);
      }
    });
  });
  /*
   * Second example, producing 1 counter (counting up)
   */
  var stopwatch = new Stopwatch({
    'element': $('.countup-timer'),     // DOM element
    'paused': false,                    // Status
    'elapsed': 0,                       // Current time in milliseconds
    'countingUp': true,                 // Counting up or down
    'timeLimit': 1000 * 60 * 1,         // Time limit in milliseconds
    'updateRate': 100,                  // Update rate, in milliseconds
    'onTimeUp': function() {            // onTimeUp callback
      this.stop();
      $(this.element).html('Countdown finished!');
    },
    'onTimeUpdate': function() {        // onTimeUpdate callback
      var t = this.elapsed,
          h = ('0' + Math.floor(t / 3600000)).slice(-2),
          m = ('0' + Math.floor(t % 3600000 / 60000)).slice(-2),
          s = ('0' + Math.floor(t % 60000 / 1000)).slice(-2);
      var formattedTime = h + ':' + m + ':' + s;
      $(this.element).html(formattedTime);
    }
  });
});

Example/Demo

当倒数计时器到达0时，它会将轮播的当前位置转换到最后一张幻灯片并停止计数器的运行。

由于之前的和 next 按钮需要包含在我的项目中，因此用户可能希望在倒数计时器完成之前手动导航到此位置。

如果计数器到达最后一张幻灯片，我如何暂停或停止计数器？

Answer 1

您可以聆听光滑的afterChange事件，并在处理时根据当前幻灯片的位置与总幻灯片数量的比较来启动或停止秒表。例如：

  $('.qa').on('afterChange', function(slick, currentSlide) {
    if(currentSlide.currentSlide < currentSlide.slideCount - 1) {
      theStopwatch.start();
    } else {
      theStopwatch.stop();
    }
  });

在页面更改时，此片段会暂停最后一张幻灯片上的秒表并在之前的任何幻灯片上恢复。

请注意，我将秒表称为theStopwatch。您需要让事件处理程序可以访问主秒表。

来源：http://kenwheeler.github.io/slick/（搜索'afterChange'）

最后一张幻灯片暂停/停止计数器

1 个答案: