问如何渲染React的缓存组件？

EN

window.CacheHolder = new Map()
export default class TestComponent extends Component {  
    constructor(props) {  
        super(props)  
    }  

    componentWillUnMount(){    
        // to cache this component.  
        window.CacheHolder.set('TestComponent', this);
    }  

    render() {  
        const cachedComponent = window.CacheHolder.get('TestComponent')  
        if (cachedComponent) {  
            return cachedComponent  
        }  
        return ...   
    }  
}