Question

我正在建立一个房地产网站，并且我希望在网站上进行图像幻灯片放映，其中包含该物业的照片。我正在使用HTML，CSS和JavaScript来做到这一点。

一切似乎都正常，除非我对不透明性有疑问。在不透明度变为0之前，我的图像会瞬间显示。我已经检查了Chrome devtools中的幻灯片，这就是我所知道的不透明度问题。请让我知道你们是否可以找到我的代码中的错误！我很感激！

HTML代码

<!-- SLIDESHOW -->

<div class="slideshow-container">

        <!-- Full-width images with number and caption text -->
        <div class="mySlides fade">
          <div class="numbertext">1 / 3</div>
          <img src="img/main.jpg" style="width:100%">
          <div class="text">Caption Text</div>
        </div>

        <div class="mySlides fade">
          <div class="numbertext">2 / 3</div>
          <img src="img/malibu.jpg" style="width:100%">
          <div class="text">Caption Two</div>
        </div>

        <div class="mySlides fade">
          <div class="numbertext">3 / 3</div>
          <img src="img/test-img.jpg" style="width:100%">
          <div class="text">Caption Three</div>
        </div>

        <!-- Next and previous buttons -->
        <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
        <a class="next" onclick="plusSlides(1)">&#10095;</a>
      </div>
      <br>

      <!-- The dots/circles -->
      <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> 
      </div>

CSS

* {
  box-sizing: border-box
}
body {
  font-family: Verdana, 
  sans-serif; margin:0
}
.mySlides {
   display: none
}
img {
  vertical-align: middle;
}

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

.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -22px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}

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

.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}

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

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

.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;
}

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

@-webkit-keyframes fade {
  from {opacity: 0} 
  to {opacity: 1}
}

@keyframes fade {
  from {opacity: 0} 
  to {opacity: 1}
}

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

JavaScript

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";
}

Answer 1

尝试设置animation-duration: 0s

Answer 2

只需将此代码添加到您的JS代码下方即可。

var autoslideIndex = 0;
autoSlides();  
function autoSlides() {
  var i;
  var slides= document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  for (i = 0; i < slides.length; i++) {
    slides[i].style.display = "none";  
  }
  autoslideIndex++;
  if (autoslideIndex > slides.length) {autoslideIndex  = 1}    
  for (i = 0; i < dots.length; i++) {
    dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[autoslideIndex-1].style.display = "block";  
  dots[autoslideIndex-1].className += " active";
  setTimeout(autoSlides, 2000); // Change image every 2 seconds
}

为什么我的幻灯片图像在淡入之前会短暂出现？

2 个答案: