フェード効果またはスライド効果を備えたシンプルな jQuery 画像スライダーを作成する方法

<ul class="images">
  <li>
    <img src="images/1.jpg" alt="1" />
  </li>
  <li>
    <img src="images/2.jpg" alt="2" />
  </li>
  ...
</ul>

<ul class="triggers">
  <li>1</li>
  <li>2</li>
  ...
</ul>

ul.images {
  position: relative;
}
ul.images li {
  position: absolute;
}

var target;
var triggers = $('ul.triggers li');
var images = $('ul.images li');
var lastElem = triggers.length - 1;

triggers.first().addClass('active');
images.hide().first().show();

function sliderResponse(target) {
  images.fadeOut(300).eq(target).fadeIn(300);
  triggers.removeClass('active').eq(target).addClass('active');
}

.mask {
  float: left;
  margin: 40px;
  width: 270px;
  height: 266px;
  overflow: hidden;
}
ul.images {
  position: relative;
  top: 0px;
  left: 0px;
}
/* This width must be the total width of the images, calculated with jQuery. */
ul.images li {
  float: left;
}

var target;
var triggers = $('ul.triggers li');
var images = $('ul.images li');
var lastElem = triggers.length - 1;
var mask = $('.mask ul.images');
var imgWidth = images.width();

triggers.first().addClass('active');
mask.css('width', imgWidth * (lastElem + 1) + 'px');

function sliderResponse(target) {
  mask.stop(true, false).animate({ 'left': '-' + imgWidth * target + 'px' }, 300);
  triggers.removeClass('active').eq(target).addClass('active');
}

triggers.click(function() {
  if (!$(this).hasClass('active')) {
    target = $(this).index();
    sliderResponse(target);
    resetTiming();
  }
});

$('.next').click(function() {
  target = $('ul.triggers li.active').index();
  target === lastElem ? target = 0 : target = target + 1;
  sliderResponse(target);
  resetTiming();
});

$('.prev').click(function() {
  target = $('ul.triggers li.active').index();
  lastElem = triggers.length - 1;
  target === 0 ? target = lastElem : target = target - 1;
  sliderResponse(target);
  resetTiming();
});

function sliderTiming() {
  target = $('ul.triggers li.active').index();
  target === lastElem ? target = 0 : target = target + 1;
  sliderResponse(target);
}

var timingRun = setInterval(function() { sliderTiming(); }, 5000);

function resetTiming() {
  clearInterval(timingRun);
  timingRun = setInterval(function() { sliderTiming(); }, 5000);
}