ckeditor4源始终添加额外的html类和元素

Question

我正在使用ckeditor 4，但是每次我写东西并单击源工具时，它都会添加我不需要的额外类和html标签。我该如何删除？

这是我的截图

输入版本

源版本

预期来源

这是我的config.js

CKEDITOR.editorConfig = function( config )
{

  config.filebrowserBrowseUrl = "/ckeditor/attachment_files";
  config.filebrowserFlashBrowseUrl = "/ckeditor/attachment_files";
  config.filebrowserFlashUploadUrl = "/ckeditor/attachment_files";
  config.filebrowserImageBrowseLinkUrl = "/ckeditor/pictures";
  config.filebrowserImageBrowseUrl = "/ckeditor/pictures";
  config.filebrowserImageUploadUrl = "/ckeditor/pictures?";
  config.filebrowserUploadUrl = "/ckeditor/attachment_files";
  config.allowedContent = true;
  config.removeDialogTabs = 'link:upload;image:Upload;image:advanced';


    config.toolbar = [
        { name: 'clipboard',   groups: [ 'clipboard', 'undo' ], items: ['Paste', 'PasteText', 'PasteFromWord', '-', 'Undo', 'Redo' ] },
        { name: 'links', items: [ 'Link', 'Unlink']  },
        { name: 'insert', items: [ 'Image', 'Table' ] },
        { name: 'forms' },
        { name: 'tools' },
        { name: 'document',    groups: [ 'mode', 'document', 'doctools' ], items: [ 'Source']  },
        { name: 'others' },
        '/',
        { name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ], items: [ 'Bold', 'Italic', 'Underline', 'Strike', 'Subscript', 'Superscript', '-', 'RemoveFormat' ] },
        { name: 'paragraph',   groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ], items: [ 'NumberedList', 'BulletedList', '-', 'Outdent', 'Indent', '-', 'Blockquote', '-', 'JustifyLeft', 'JustifyCenter', 'JustifyRight', 'JustifyBlock' ] },
        { name: 'styles', items: [ 'Styles', 'Format', 'Font', 'FontSize' ] },
        { name: 'colors', items: [ 'TextColor', 'BGColor' ] },
        { name: 'about' }
    ];

};

这是我的ckeditor.rb

Ckeditor.setup do |config|

  require 'ckeditor/orm/active_record'
  config.cdn_url = "//cdn.ckeditor.com/4.7.1/standard/ckeditor.js"
  config.js_config_url = 'ckeditor/config.js'
end

不知道我在这里做错了什么，但是为什么格式对于源版本却无法正常工作。

谢谢