移动应用监测特价活动

// 图片懒加载
document.addEventListener("DOMContentLoaded", function() {
  let lazyImages = [].slice.call(document.querySelectorAll("img.lazy"));
  if ("IntersectionObserver" in window) {
    let lazyImageObserver = new IntersectionObserver(function(entries, observer) {
      entries.forEach(function(entry) {
        if (entry.isIntersecting) {
          let lazyImage = entry.target;
          lazyImage.src = lazyImage.dataset.src;
          lazyImage.classList.remove("lazy");
          lazyImageObserver.unobserve(lazyImage);
        }
      });
    });
    lazyImages.forEach(function(lazyImage) {
      lazyImageObserver.observe(lazyImage);
    });
  }
});

// 使用Web Workers处理复杂计算
if (window.Worker) {
  const myWorker = new Worker("worker.js");
  myWorker.postMessage("start");
  myWorker.onmessage = function(e) {
    console.log("Result: ", e.data);
  };
}