简单的jQuery滑块

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html

css

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html

<div class="slider__controls">
      <span class="slider__control js__slider__control--prev slider__control--prev">Prev</span>
      
      <ol class="js__slider__pagers slider__pagers"></ol>
      
      <span class="slider__control js__slider__control--next slider__control--next">Next</span>
    </div>
  </div>
  
  <footer class="footer">
    <p>For when 'really simple' is all you need</p>
  </footer>
 </div>

css

body {
  margin: 0;
  position: relative;
}

.slider {
  max-width: 800px;
}

.slider__images {
  opacity: 0;
  visibility: hidden;
  position: relative;
  top: 0px;
  left: 0px;
  list-style-type: none;
  transition: opacity .4s ease-in, visibility .4s ease-in;
}
.slider__images.loaded {
  opacity: 1;
  visibility: visible;
}
.slider__images-item {
  position: absolute;
  top: 0px;
  left: 0px;
}
.no-js .slider__images-item:first-of-type {
  position: relative;
}
.no-js .slider__images-item:not(:first-of-type) {
  display: none !important;
}
.slider__images-image {
  display: block;
}

.slider__controls {
  margin-top: 30px;
  user-select: none;
  text-align: center;
}

.slider__control {
  display: inline-block;
  color: #829995;
  cursor: pointer;
}

.slider__control--prev {
  margin-right: 10px;
}

.slider__control--next {
  margin-left: 10px;
}

.slider__pagers {
  display: inline-block;
  margin: 0;
  padding: 0;
  list-style-type: none;
}
.slider__pagers li {
  display: inline-block;
  margin: 0 5px;
  cursor: pointer;
  color: #829995;
  padding: 0 10px;
}
.slider__pagers li.active {
  color: #333;
}

body {
  background: #EF629F;
  background: linear-gradient(to right, #EF629F, #EECDA3);
  font-family: Avenir, 'Proxima Nova', sans-serif;
  font-weight: normal;
  line-height: 1.5;
}

ul,
ol,
div {
  margin: 0;
  padding: 0;
}

img {
  max-width: 100%;
}

h1 {
  margin-top: 30px;
  color: #fff;
  font-size: 18px;
  font-weight: normal;
  letter-spacing: 4px;
  text-transform: uppercase;
}

.wrapper {
  padding: 30px;
}

.header,
.footer {
  margin: auto;
  max-width: 800px;
  text-align: center;
  color: #fff;
}
.header a,
.footer a {
  color: #fff;
}

.footer {
  margin-top: 30px;
}

.slider {
  margin: 30px auto 0;
  padding: 30px;
  background: white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

JavaScript

// create pager list items
var sliderImage = $('.slider__images-image');

sliderImage.each(function (index) {
    $('.js__slider__pagers').append('<li>'+(index+1)+'</li>');
});

// set up vars
var sliderPagers       = 'ol.js__slider__pagers li',
    sliderPagersActive = '.js__slider__pagers li.active',
    sliderImages       = '.js__slider__images',
    sliderImagesItem   = '.slider__images-item',
    sliderControlNext  = '.slider__control--next',
    sliderControlPrev  = '.slider__control--prev',
    sliderSpeed        = 5000,
    lastElem           = $(sliderPagers).length-1,
    sliderTarget;

// add css heigt to slider images list
function checkImageHeight() {
    var sliderHeight = $('.slider__images-image:visible').height(); 
    $(sliderImages).css('height', sliderHeight+'px');
};

sliderImage.on('load', function() {
    checkImageHeight();
    $(sliderImages).addClass('loaded')
});
$(window).resize(function(){
    checkImageHeight();
});

// set up first slide
$(sliderPagers).first().addClass('active');
$(sliderImagesItem).hide().first().show();

// transition function
function sliderResponse(sliderTarget) {
    $(sliderImagesItem).fadeOut(300).eq(sliderTarget).fadeIn(300);
    $(sliderPagers).removeClass('active').eq(sliderTarget).addClass('active');
}

// pager controls
$(sliderPagers).on('click', function() {
    if ( !$(this).hasClass('active') ) {
        sliderTarget = $(this).index();
        sliderResponse(sliderTarget);
        resetTiming();
    }
});

// next/prev controls
$(sliderControlNext).on('click', function() {
    sliderTarget = $(sliderPagersActive).index();
    sliderTarget === lastElem ? sliderTarget = 0 : sliderTarget = sliderTarget+1;
    sliderResponse(sliderTarget);
    resetTiming();
});
$(sliderControlPrev).on('click', function() {
    sliderTarget = $(sliderPagersActive).index();
    lastElem = $(sliderPagers).length-1;
    sliderTarget === 0 ? sliderTarget = lastElem : sliderTarget = sliderTarget-1;
    sliderResponse(sliderTarget);
    resetTiming();
});

// slider timing
function sliderTiming() {
    sliderTarget = $(sliderPagersActive).index();
    sliderTarget === lastElem ? sliderTarget = 0 : sliderTarget = sliderTarget+1;
    sliderResponse(sliderTarget);
}

// slider autoplay
var timingRun = setInterval(function() {
    sliderTiming();
}, sliderSpeed);

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

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