如何使用javascript逐个上传文件

<form id="uploadForm">
  <input type="file" id="fileInput" multiple>
  <button type="submit">上传</button>
</form>

document.getElementById('uploadForm').addEventListener('submit', function(event) {
  event.preventDefault();
  uploadFiles();
});

function uploadFiles() {
  var files = document.getElementById('fileInput').files;
  // 处理文件上传逻辑
}

function uploadFiles() {
  var files = document.getElementById('fileInput').files;
  for (var i = 0; i < files.length; i++) {
    var file = files[i];
    var formData = new FormData();
    formData.append('file', file);

    var xhr = new XMLHttpRequest();
    xhr.open('POST', '/upload', true);
    xhr.onload = function() {
      if (xhr.status === 200) {
        console.log('文件上传成功');
      } else {
        console.log('文件上传失败');
      }
    };
    xhr.send(formData);
  }
}