javascript - 随机幻灯片仅在超过两张幻灯片时才有效

Question

我有这个 randomize() 函数来随机化 Slick Slider 中的幻灯片。它有效，但在 Firefox 中它仅在有超过两张幻灯片时有效。 谁能看出这是为什么？

Js:

  $.fn.randomize = function(selector) {
    var $el = selector ? $(this).find(selector) : $(this).children(),
      $pars = $el.parent();

    $pars.each(function() {
      $(this).children(selector).sort(function(chA, chB) {
        if ($(chB).index() !== $(this).children(selector).length - 1) {
          return Math.round(Math.random()) - 0.5;
        }
      }.bind(this)).detach().appendTo(this);
    });
    return this;
  };

  $('.slider').randomize().slick();

HTML:

<div class="slider">
  <div>
    <img src="https://kenwheeler.github.io/slick/img/fonz1.png" />
  </div>
  <div>
    <img src="https://kenwheeler.github.io/slick/img/fonz2.png" />
  </div>
  <! -- Uncomment to see it working in FF 
   <div>
    <img src="https://kenwheeler.github.io/slick/img/fonz3.png" />
  </div> -->
</div>

jSFiddle here

Answer 1

一种选择是使用get() 将jQuery 对象转换为数组使用此SO answer 的混洗代码.并使用 html 更新父 div

$.fn.randomize = function(selector) {
  var $el = selector ? $(this).find(selector) : $(this).children(),
    $pars = $el.parent(),
    array = $el.get();

  var currentIndex = array.length,
    temporaryValue, randomIndex;

  // While there remain elements to shuffle...
  while (0 !== currentIndex) {
    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;

    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }

  $pars.html(array);
  return this;
};

$('.slider').randomize();

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="slider">
  <div>
    1
  </div>
  <div>
    2
  </div>
  <div>
    3
  </div>
</div>