var extensions = ['.jpg', '.png', '.gif'];

var imageElements = document.getElementsByClassName('main-illust');

// 使用传统的循环替代 Array.from().forEach
for (var i = 0; i < imageElements.length; i++) {
  (function() {
    var imageElement = imageElements[i];
    var baseUrl = imageElement.src;
    tryLoadImage(imageElement, baseUrl, 0);
  })(); // 使用立即执行的函数表达式，避免循环中闭包问题
}

function tryLoadImage(imageElement, baseUrl, extensionIndex) {
  if (extensionIndex >= extensions.length) {
    console.log("无法加载图片，隐藏图片。");
    imageElement.parentElement.style.display = 'none';
    return;
  }

  var timestamp = new Date().getTime();
  var newSrc = baseUrl + extensions[extensionIndex] + "?t=" + timestamp;

  var img = new Image();
  img.onload = function() {
    imageElement.src = newSrc;
    imageElement.style.display = 'block';
    console.log("图片加载成功:", newSrc);
  };

  img.onerror = function() {
    tryLoadImage(imageElement, baseUrl, extensionIndex + 1);
  };

  img.src = newSrc;
}