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我想創建一個sideshow，將自動從一個圖片過渡到下一個，但也能夠讓用戶手動更改幻燈片使用上一個和下一個指標。自動幻燈片prev和下一個指標
我使用的教程從這個鏈接： https://www.w3schools.com/howto/howto_js_slideshow.asp
但他們不合並兩個在一起，我找不到任何辦法得到它的工作。
這是代碼，我有：
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", "");
}
if (slideIndex> slides.length) {slideIndex = 1}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
}/* Slideshow container */
.slideshow-container {
display: flex;
display: -webkit-flex; /* Safari 8 */
flex-wrap: wrap;
-webkit-flex-wrap: wrap; /* Safari 8 */
justify-content: center;
-webkit-justify-content: center;
margin-left: auto;
margin-right: auto;
margin-bottom: 4%;
width: auto;
position: relative;
cursor: pointer;
box-sizing: border-box;
}
.slideshow-container img {
box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
border-radius: 3px;
}
@media screen and (max-width: 1000px) {
.slideshow-container {
margin-left: auto;
margin-right: auto;
max-width: 100%;
}
}
.mySlides {
display: none;
}
/* Next & previous buttons */
.prev, .next {
cursor: pointer;
position: absolute;
top: 45%;
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;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
.prev {
left: 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);
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 50px;
width: 100%;
text-align: center;
}
/* The dots/bullets/indicators */
.dot {
cursor: pointer;
height: 13px;
width: 13px;
bottom: 50px;
margin: 0 2px;
position: relative;
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: 4s;
animation-name: fade;
animation-duration: 4s;
}
@-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
@keyframes fade {
from {opacity: .4}
to {opacity: 1}
}<div class="slideshow-container">
<div class="mySlides fade"><a href="#"><img src="https://appraw.com/static/previews/downloads/d/z/k/p-desert-zK6WoOEYks-1.jpg" style="width:100%"></a></div>
<div class="mySlides fade"><a href="#"><img src="http://www.firstnaturetours.com/images/content/oregon-coast-2000x800.jpg" style="width:100%"></a></div>
<div class="mySlides fade"><a href="#"><img src="http://hdwallpapersbuzz.com/wp-content/uploads/2016/11/Sunrise-Beach-Koh-Lipe-Thailand-HD-Photo-17.jpg" style="width:100%"></a></div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
<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>
</div>
真棒。謝謝，我得到它的工作。我可以弄清楚如何修復圓形按鈕，但我一直試圖弄清楚這一點，並且你幫了我一些忙。 Upvoted – Michael
不客氣。 – Sank6