如何在同一个html文档中进行多个幻灯片显示？

Question

我在这里使用w3schools示例： https : //www.w3schools.com/howto/howto_js_slideshow.asp ，但是当我尝试添加第二个幻灯片时，直到我浏览第一个幻灯片时，它才会出现。 IE一次只打开一个幻灯片。 如何同时显示和使用多个幻灯片（最少4个）？

Answer 1

为每个幻灯片容器分配一个ID，并将其提供给所有幻灯片功能。 此外，使用同一对象跟踪当前幻灯片索引。

 var slideshow1 = document.getElementById("slideshow1"); slideshow1.currentSlideIndex = 1; showSlides(slideshow1.currentSlideIndex, slideshow1); var slideshow2 = document.getElementById("slideshow2"); slideshow2.currentSlideIndex = 1; showSlides(slideshow2.currentSlideIndex, slideshow2); function plusSlides(n, slideshow) { showSlides(slideshow.currentSlideIndex += n, slideshow); } function currentSlide(n, slideshow) { showSlides(slideshow.currentSlideIndex = n, slideshow); } function showSlides(n, slideshow) { var i; var slides = slideshow.getElementsByClassName("mySlides"); var dots = slideshow.getElementsByClassName("dot"); if (n > slides.length) {slideshow.currentSlideIndex = 1} if (n < 1) {slideshow.currentSlideIndex = 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[slideshow.currentSlideIndex-1].style.display = "block"; dots[slideshow.currentSlideIndex-1].className += " active"; } 

 * {box-sizing:border-box} body {font-family: Verdana,sans-serif;margin:0} .mySlides {display:none} /* 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: 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; } /* 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: 8px; 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: 13px; width: 13px; 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: .4} to {opacity: 1} } @keyframes fade { from {opacity: .4} to {opacity: 1} } /* On smaller screens, decrease text size */ @media only screen and (max-width: 300px) { .prev, .next,.text {font-size: 11px} } 

 <div id="slideshow1" 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,slideshow1)">&#10094;</a> <a class="next" onclick="plusSlides(1, slideshow1)">&#10095;</a> <div style="text-align:center"> <span class="dot" onclick="currentSlide(1, slideshow1)"></span> <span class="dot" onclick="currentSlide(2, slideshow1)"></span> <span class="dot" onclick="currentSlide(3, slideshow1)"></span> </div> </div> <br> <div id="slideshow2" 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, this.parentNode)">&#10094;</a> <a class="next" onclick="plusSlides(1, this.parentNode)">&#10095;</a> <div style="text-align:center"> <span class="dot" onclick="currentSlide(1, slideshow2)"></span> <span class="dot" onclick="currentSlide(2, slideshow2)"></span> <span class="dot" onclick="currentSlide(3, slideshow2)"></span> </div> </div> <br>