Question

根据以下代码，您可以帮助使用多个幻灯片吗？如果页面上只有一个幻灯片，它可以正常工作，在其他情况下，我必须多次复制代码并为元素提供不同的ID。有没有解决方案可以解决这个问题而无需复制代码？

以下是w3schools的代码：

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

Answer 1

如果您想在多个幻灯片中使用相同的代码，可以向showSlides函数添加参数

   var slideIndex = 1;

showSlides(slideIndex,"mySlides","dots");

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

function currentSlide(n,nSliders,nDots) {
  showSlides(slideIndex = n,nSliders,nDots);
}
function showSlides(n,nSliders,nDots) {
  var i;
  var slides = document.getElementsByClassName(String(nSliders));
  var dots = document.getElementsByClassName(nDots);
  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";
}

像这样你只需要在html文件中改变函数的参数

HTML：

<div class="slideshow-container">

<div class="mySlides fade">
  <div class="numbertext">1 / 3</div>
  <img src="img_nature_wide.jpg" style="width:100%">
  <div class="text">Caption Text</div>
</div>

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

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

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

</div>
<br>

<div style="text-align:center">
  <span class="dot" onclick="currentSlide(1,'mySlides','dots')"></span> 
  <span class="dot" onclick="currentSlide(2,'mySlides','dots')"></span> 
  <span class="dot" onclick="currentSlide(3,'mySlides','dots')"></span> 
</div>

一页中有多个幻灯片

1 个答案: