SOURCE

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  if (n > slides.length) {slideIndex = 1} 
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none"; 
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block"; 
  dots[slideIndex-1].className += " active";
}

<div class="slideshow-container">
  <div class="mySlides fade">
    <div class="numbertext">1 / 7</div>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1497283245931&di=d19539777643679554c70b4f531c6fb4&imgtype=jpg&src=http%3A%2F%2Fimg1.imgtn.bdimg.com%2Fit%2Fu%3D2183680049%2C3013720414%26fm%3D214%26gp%3D0.jpg">
    <div class="text">文本 1</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">2 / 7</div>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1497282569625&di=13b4595c2f1f390db3f2f54fde37be80&imgtype=0&src=http%3A%2F%2Fg.hiphotos.baidu.com%2Fbaike%2Fw%253D268%2Fsign%3D5913f92b84d6277fe912353e10391f63%2Fb3fb43166d224f4afeb61e830af790529822d177.jpg">
    <div class="text">文本 2</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">3 / 7</div>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1497282820071&di=e44597f5c311cf9fe691b95e3aa1500a&imgtype=0&src=http%3A%2F%2Fwww.kfzimg.com%2FG03%2FM00%2F6D%2F86%2FpYYBAFYgYraAIdpAAAAqnu9XGvI881_b.jpg">
    <div class="text">文本 3</div>
  </div>
   <div class="mySlides fade">
    <div class="numbertext">4 / 7</div>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1497284754616&di=e658f8f8be596c28566edc1ff5cd3ea5&imgtype=0&src=http%3A%2F%2Fimgsrc.baidu.com%2Fbaike%2Fpic%2Fitem%2F1f178a82b9014a9005f37c1fab773912b21bee47.jpg">
    <div class="text">文本 4</div>
  </div> <div class="mySlides fade">
    <div class="numbertext">5/7</div>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1497283092962&di=32a01e89fce14974350a31b19c492d8d&imgtype=0&src=http%3A%2F%2Fshulaquan.com%2Fwp-content%2Fuploads%2F2016%2F01%2F7.jpg">
    <div class="text">文本 5</div>
  </div> <div class="mySlides fade">
    <div class="numbertext">6/7</div>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1497284877582&di=caf2ce01ce673830310a5fc8c37f14d1&imgtype=0&src=http%3A%2F%2Fpic.beifabook.com%2FBook%2FB%2F7514%2F50%2FB751450541.gif">
    <div class="text">文本 6</div>
  </div> <div class="mySlides fade">
    <div class="numbertext">7/ 7</div>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1497284974740&di=0c7aaf363d436fcaf684e5e8f95d956c&imgtype=0&src=http%3A%2F%2Fimg10.360buyimg.com%2Fn0%2Fjfs%2Ft172%2F83%2F161829151%2F49742%2Fd7609c19%2F53830207N5a3b6213.jpg">
    <div class="text">文本 7</div>
  </div>

   <a class="prev" onclick="plusSlides(-1)">❮</a>
  <a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>

<div style="text-align:center">
  <span class="dot" onclick="currentSlide(1)"></span> 
   <span class="dot" onclick="currentSlide(2)"></span>
  <span class="dot" onclick="currentSlide(3)"></span>
  <span class="dot" onclick="currentSlide(4)"></span> 
  <span class="dot" onclick="currentSlide(5)"></span> 
   <span class="dot" onclick="currentSlide(6)"></span>
   <span class="dot" onclick="currentSlide(7)"></span>
</div>

* {box-sizing:border-box}
body {font-family: Verdana,sans-serif;}
.mySlides {display:none}
/* 幻灯片容器 */
.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}

/* 下一张 & 上一张 按钮 */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
}

/* 定位 "下一张" 按钮靠右 */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}

/* 标题文本 */
.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
}

/* 数字文本 (1/7 等) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

/* 标记符号 */
.dot {
  cursor:pointer;
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #717171;
}

/* 淡出动画 */
.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 1.5s;
  animation-name: fade;
  animation-duration: 1.5s;
}

@-webkit-keyframes fade {
  from {opacity: .8} 
  to {opacity: 1}
}

@keyframes fade {
  from {opacity: .8} 
  to {opacity: 1}
}