如何随机化图像滑块的顺序

Question

I have a image slider code which is working good. But I need to randomise the order of the pics so NOT everytime pic1 is shown first, pic2 shown second and than pic3 shown third. I want to randomise the order of the pics so evertytime page is load, pics to have different order. And I need help with that. Here is my code:

 <img class="mySlides" src="pic1.jpg">
 <img class="mySlides" src="pic2.jpg">
 <img class="mySlides" src="pic3.jpg">


<script>
var myIndex = 0;
carousel();

function carousel() {
  var i;
  var x = document.getElementsByClassName("mySlides");
  for (i = 0; i < x.length; i++) {
    x[i].style.display = "none";  
  }
  myIndex++;
  if (myIndex > x.length) {myIndex = 1}    
  x[myIndex-1].style.display = "block";  
  setTimeout(carousel, 2000); // Change image every 2 seconds
}
</script>

Answer 1

Change the order of elements in-place may help you.

 let index = 0; function randomise_list() { const list = document.querySelector("#slider"); for (let i = list.children.length; i >= 0; i--) { list.appendChild(list.children[Math.random() * i | 0]); } } function run_carousel() { const slides = document.querySelectorAll(".slide"); for (let i = 0; i < slides.length; i++) { slides[i].style.display = "none"; } index++; if (index > slides.length) index = 1; slides[index - 1].style.display = "block"; setTimeout(run_carousel, 2000); // Change image every 2 seconds } randomise_list(); run_carousel();

 <div id="slider"> <img class="slide" src="https://via.placeholder.com/50x50/333333/cccccc?text=1"> <img class="slide" src="https://via.placeholder.com/50x50/333333/cccccc?text=2"> <img class="slide" src="https://via.placeholder.com/50x50/333333/cccccc?text=3"> </div>

Answer 2

Using Math.random() like it is used here :

<img class="mySlides" src="pic1.jpg" />
<img class="mySlides" src="pic2.jpg" />
<img class="mySlides" src="pic3.jpg" />

<script>
var myIndex = 0;
carousel();

function carousel() {
  var i;
  var x = document.getElementsByClassName("mySlides");
  for (i = 0; i < x.length; i++) {
    x[i].style.display = "none";  
  }
  myIndex = getRandomInt(0, x.length - 1);
  x[myIndex].style.display = "block";  
  setTimeout(carousel, 2000); // Change image every 2 seconds
}

function getRandomInt(min, max) {
    min = Math.ceil(min);
    max = Math.floor(max);
    return Math.floor(Math.random() * (max - min + 1)) + min;
}
</script>