手机端焦点图js

const images = document.querySelectorAll('.focus-image');
const observer = new IntersectionObserver((entries, observer) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      const image = entry.target;
      image.src = image.dataset.src;
      observer.unobserve(image);
    }
  });
});
images.forEach(image => observer.observe(image));

let autoPlayInterval;
function startAutoPlay() {
  autoPlayInterval = setInterval(() => {
    // 自动切换逻辑
  }, 3000);
}
function stopAutoPlay() {
  clearInterval(autoPlayInterval);
}

// 手动切换时调用 stopAutoPlay ，切换完成后调用 startAutoPlay