javascript - 幻灯片按钮下划线和淡出动画

Question

我目前使用的是默认形状的幻灯片指示器，它是点/子弹形指示器。

问题:

• 每次我的鼠标悬停在下一个按钮上时，它都会在按钮下方显示一条下划线。有办法去除吗？
• 有没有办法将淡入淡出动画更改为淡出？

由于时间限制，我没有太多时间从头开始制作幻灯片，所以我主要从 W3School 网站上获取这段代码并按原样使用它。

这是 HTML 代码的一部分:

var slideIndex = 1;
var timer = null;
showSlides(slideIndex);

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

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

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  if (n == undefined) {
    n = ++slideIndex
  }
  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";
  timer = setTimeout(showSlides, 4000);
}

* {
  box-sizing: border-box
}

<meta name="viewport" content="width=device-width, initial-scale=1.0">body {
  font-family: Verdana, sans-serif;
  margin: 0
}

.mySlides {
  display: none
}

img {
  vertical-align: middle;
}


/* Slideshow container */

.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}


/* Next & previous buttons */

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


/* Position the "next button" to the right */

.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}


/* Caption text */

.text {
  background-color: #424242;
  color: #ffffff;
  opacity: 0.8;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 0px;
  width: 100%;
  text-align: center;
}


/* Number text (1/3 etc) */

.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}


/* The dots/bullets/indicators */

.dot {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

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


/* Fading animation */

.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 1.5s;
  animation-name: fade;
  animation-duration: 1.5s;
}

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

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


/* On smaller screens, decrease text size */

@media only screen and (max-width: 300px) {
  .prev,
  .next,
  .text {
    font-size: 11px
  }
}

<div class="slideshow-container">
  <h1 class="page_title">IR</h1>
  <div class="mySlides fade">
    <a href="/ir/library/results_briefing/"></a>
    <img src="/ir/images/slider_img02.jpg" alt="A" style="width:100%">
    <div class="text">A</div>
  </div>

  <div class="mySlides fade">
    <a href="/ir/investment/event/"></a>
    <img src="/ir/images/slider_img01.jpg" alt="A" style="width:100%">
    <div class="text">A</div>
  </div>

  <div class="mySlides fade">
    <a href="/ir/library/"></a>
    <img src="/ir/images/slider_img03.jpg" alt="IRA" style="width:100%">
    <div class="text">IRA</div>
  </div>

  <div class="mySlides fade">
    <a href="/ir/business/message/"></a>
    <img src="/ir/images/slider_img04.jpg" alt="A" style="width:100%">
    <div class="text">A</div>
  </div>

  <div class="mySlides fade">
    <a href="/ir/calendar/"></a>
    <img src="/ir/images/slider_img05.jpg" alt="A" style="width:100%">
    <div class="text">A</div>
  </div>

  <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
  <a class="next" onclick="plusSlides(1)">&#10095;</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>
</div>

Answer 1

我无法重现，因为 CSS 对齐有点不合适。但我的第一个猜测是使用以下内容删除下划线。

.next, .prev { text-decoration: none; }