如果dropzone js中的文件上传未完成，则禁用提交按钮

Dropzone.options.myDropzone = {
  // 其他配置项...
  
  init: function() {
    var submitButton = document.querySelector("#submit-button");
    this.on("sending", function() {
      submitButton.disabled = true;
    });
  }
};

Dropzone.options.myDropzone = {
  // 其他配置项...
  
  init: function() {
    var submitButton = document.querySelector("#submit-button");
    this.on("sending", function() {
      submitButton.disabled = true;
    });
    this.on("complete", function() {
      if (this.getQueuedFiles().length === 0 && this.getUploadingFiles().length === 0) {
        submitButton.disabled = false;
      }
    });
  }
};