问添加了自己的css类的Draftail块引用，这是可能的吗？

EN

def poquote_entity_decorator(props):
    """
    Draft.js ContentState to database HTML.
    Converts the poquote entities into a blockquote with class tag.
    """
    return DOM.create_element('blockquote', {
        'class': 'pullout',
    }, props['children'])


class PoQuoteEntityElementHandler(InlineEntityElementHandler):
"""
Database HTML to Draft.js ContentState.
Converts the blockquote tag into a PoQuote entity, with the right 
data.
"""
mutability = 'IMMUTABLE'

def get_attribute_data(self, attrs):
    return {
        'poquote': attrs['class'],
    }

@hooks.register('insert_editor_js')
def draftail_editor_js():
js_files = [
    'wagtailadmin/js/draftail.js',
    'js/draftail.js',
]
js_includes = format_html_join('\n', '<script src="{0}{1}"> 
</script>',
    ((settings.STATIC_URL, filename) for filename in js_files)
)
return js_includes

@hooks.register('register_rich_text_features')
def register_poquote_feature(features):
    features.default_features.append('poquote')
    """
    Registering the `poquote` feature, which uses the `POQUOTE` 
    Draft.js entity type,
    and is stored as HTML with a `<blockquote class='pullout'>` tag.
    """
    feature_name = 'poquote'
    type_ = 'POQUOTE'

    control = {
        'type': type_,
        'icon': 'icon icon-form',
        'description': 'Pull Out Quote',
    }

    features.register_editor_plugin(
        'draftail', feature_name, 
    draftail_features.EntityFeature(control)
    )

features.register_converter_rule('contentstate', feature_name, {
    # Note here that the conversion is more complicated than for 
     blocks and inline styles.
    'from_database_format': {'blockquote[class]': 
    PoQuoteEntityElementHandler(type_)},
    'to_database_format': {'entity_decorators': {type_: 
    poquote_entity_decorator}},
})

const React = window.React;
const Modifier = window.DraftJS.Modifier;
const EditorState = window.DraftJS.EditorState;

// Not a real React component – just creates the entities as soon as 
it is rendered.
class PoqSource extends React.Component {
    componentDidMount() {
        const { editorState, entityType, onComplete } = this.props;

        const content = editorState.getCurrentContent();
        const selection = editorState.getSelection();

        const anchorKey = selection.getAnchorKey();
        const currentBlock = content.getBlockForKey(anchorKey);

        const start = selection.getStartOffset();
        const end = selection.getEndOffset();
        const selectedText = currentBlock.getText().slice(start, 
end);

       // Uses the Draft.js API to create a new entity with the right 
data.
       const contentWithEntity = 
content.createEntity(entityType.type, 'IMMUTABLE', {
        poq: selectedText,
       });
       const entityKey = contentWithEntity.getLastCreatedEntityKey();


       // We also add some text for the entity to be activated on.
       const text = `${selectedText}`;

       const newContent = Modifier.replaceText(content, selection, 
text, null, entityKey);
       const nextState = EditorState.push(editorState, newContent, 
'insert-characters');

       onComplete(nextState);
    }

    render() {
        return null;
    }
}

const Poq = (props) => {
    const { entityKey, contentState } = props;
    const data = contentState.getEntity(entityKey).getData();

    return React.createElement('blockquote',  {className: 'pullout'}, 
props.children);
};

window.draftail.registerPlugin({
   type: 'POQUOTE',
   source: PoqSource,
   decorator: Poq,
});

vendor.js:1 TypeError: Cannot read property 'startsWith' of undefined
at h (VM7359 draftail.js:1)
at n.value (VM7359 draftail.js:1)
at commitLifeCycles (vendor.js:1)
at e (vendor.js:1)
at x (vendor.js:1)
at w (vendor.js:1)
at batchedUpdates (vendor.js:1)
at Z (vendor.js:1)
at It (vendor.js:1)
l @ vendor.js:1
vendor.js:1 Uncaught TypeError: Cannot read property 'startsWith' of 
undefined
at h (VM7359 draftail.js:1)
at n.value (VM7359 draftail.js:1)
at commitLifeCycles (vendor.js:1)
at e (vendor.js:1)
at x (vendor.js:1)
at w (vendor.js:1)
at batchedUpdates (vendor.js:1)
at Z (vendor.js:1)
at It (vendor.js:1)
vendor.js:1 TypeError: Cannot read property 'startsWith' of undefined
at h (VM7359 draftail.js:1)
at n.value (VM7359 draftail.js:1)
at commitLifeCycles (vendor.js:1)
at e (vendor.js:1)
at x (vendor.js:1)
at w (vendor.js:1)
at batchedUpdates (vendor.js:1)
at Z (vendor.js:1)
at It (vendor.js:1)
l @ vendor.js:1
vendor.js:1 Uncaught TypeError: Cannot read property 'startsWith' of 
undefined
at h (VM7359 draftail.js:1)
at n.value (VM7359 draftail.js:1)
at commitLifeCycles (vendor.js:1)
at e (vendor.js:1)
at x (vendor.js:1)
at w (vendor.js:1)
at batchedUpdates (vendor.js:1)
at Z (vendor.js:1)
at It (vendor.js:1)