如何在draft.js中通过更改字体系列样式来设置按钮颜色

<link rel="stylesheet" href="https://unpkg.com/draft-js/dist/Draft.css" />
<script src="https://unpkg.com/draft-js/dist/Draft.js"></script>

<div id="editorContainer"></div>

const { Editor, EditorState, RichUtils } = Draft;

class MyEditor extends React.Component {
  constructor(props) {
    super(props);
    this.state = { editorState: EditorState.createEmpty() };
    this.onChange = this.onChange.bind(this);
    this.handleKeyCommand = this.handleKeyCommand.bind(this);
    this.toggleFontStyle = this.toggleFontStyle.bind(this);
  }

  onChange(editorState) {
    this.setState({ editorState });
  }

  handleKeyCommand(command, editorState) {
    const newState = RichUtils.handleKeyCommand(editorState, command);
    if (newState) {
      this.onChange(newState);
      return 'handled';
    }
    return 'not-handled';
  }

  toggleFontStyle(fontStyle) {
    this.onChange(RichUtils.toggleInlineStyle(this.state.editorState, fontStyle));
  }

  render() {
    return (
      <div>
        <button onClick={() => this.toggleFontStyle('FONT_STYLE_BOLD')}>Bold</button>
        <button onClick={() => this.toggleFontStyle('FONT_STYLE_ITALIC')}>Italic</button>
        <button onClick={() => this.toggleFontStyle('FONT_STYLE_UNDERLINE')}>Underline</button>
        <Editor
          editorState={this.state.editorState}
          handleKeyCommand={this.handleKeyCommand}
          onChange={this.onChange}
        />
      </div>
    );
  }
}

ReactDOM.render(<MyEditor />, document.getElementById('editorContainer'));