使用window.onload JavaScript添加幻灯片的上一个和下一个功能

window.onload = function() {
  // 在这里编写添加幻灯片上一个和下一个功能的代码
};

var slideshowContainer = document.getElementById("slideshow-container");

var slides = [
  { image: "slide1.jpg", title: "Slide 1" },
  { image: "slide2.jpg", title: "Slide 2" },
  { image: "slide3.jpg", title: "Slide 3" }
];

var currentSlideIndex = 0;

function updateSlide() {
  var currentSlide = slides[currentSlideIndex];
  slideshowContainer.innerHTML = "<img src='" + currentSlide.image + "' alt='" + currentSlide.title + "'>";
}

window.onload = function() {
  updateSlide();
};

var previousButton = document.getElementById("previous-button");
var nextButton = document.getElementById("next-button");

previousButton.onclick = function() {
  currentSlideIndex--;
  if (currentSlideIndex < 0) {
    currentSlideIndex = slides.length - 1;
  }
  updateSlide();
};

nextButton.onclick = function() {
  currentSlideIndex++;
  if (currentSlideIndex >= slides.length) {
    currentSlideIndex = 0;
  }
  updateSlide();
};