如何仅使用javascript上传基于数组索引的图像？

const imageArray = [
  "data:image/png;base64,iVBORw0KG...",
  "data:image/png;base64,9j4AAQSkZ...",
  "data:image/png;base64,/9j/4AAQ...",
  // 添加更多图像数据
];

<form>
  <input type="file" id="imageInput">
  <button type="submit" onclick="uploadImages()">上传图像</button>
</form>

function uploadImages() {
  const fileInput = document.getElementById("imageInput");
  const files = fileInput.files;

  for (let i = 0; i < files.length; i++) {
    const reader = new FileReader();
    reader.onload = function(e) {
      const base64Image = e.target.result;
      imageArray.push(base64Image);
    };
    reader.readAsDataURL(files[i]);
  }

  // 可以在此处调用上传图像的函数，将图像数据发送到服务器
}