React-将类添加到子组件

我一周前就弄清楚了，这就是我想要的：

export default class ContainerComponent extends React.Component {    constructor(props) {        super(props);        this.modifyChildren = this.modifyChildren.bind(this);    }    modifyChildren(child) {        const className = classNames( child.props.className, {...otherClassses}        );        const props = { className        };        return React.cloneElement(child, props);    }    render() {        return (<div> {React.Children.map(this.props.children, child => this.modifyChildren(child))}        </div>);    }}