如何在dropzone.js中将多个文件追加到formdata中

<form action="/upload" class="dropzone" id="myDropzone"></form>

var myDropzone = new Dropzone("#myDropzone", {
  url: "/upload",
  method: "post",
  maxFiles: 5,
  init: function() {
    this.on("addedfile", function(file) {
      var formData = new FormData();
      formData.append("file", file);
      // 将formData发送到服务器或进行其他操作
    });
  }
});

this.on("addedfile", function(file) {
  var formData = new FormData();
  formData.append("file", file);
  formData.append("username", "John Doe");
  // 将formData发送到服务器或进行其他操作
});

this.on("addedfile", function(file) {
  var formData = new FormData();
  formData.append("file", file);
  // 将formData发送到服务器
  $.ajax({
    url: "/upload",
    type: "POST",
    data: formData,
    processData: false,
    contentType: false,
    success: function(response) {
      // 处理上传成功的响应
    },
    error: function(xhr, status, error) {
      // 处理上传失败的情况
    }
  });
});