我是 React 新手，我创建了这样的组件；

export default class CartoviewDrawer extends React.Component {

    constructor(props) {
        super(props);
        this.state = {open: false};
    }

    _handleToggle() {
        let open = this.state.open;
        this.setState({open: !open})
    }

    render() {
        return (
            <div>
                {/*<RaisedButton*/}
                {/*label="Toggle Drawer"*/}
                {/*onTouchTap={this.handleToggle}*/}
                {/*/>*/}
                <IconButton tooltip="Toggle Drawer"
                            onTouchTap={this._handleToggle}
                >
                    <i className="material-icons">list</i>
                </IconButton>
                <IconButton iconClassName="muidocs-icon-custom-github"/>
                <Drawer open={this.state.open}>
                    <MenuItem>Menu Item</MenuItem>
                    <MenuItem>Menu Item 2</MenuItem>
                </Drawer>
            </div>
        );
    }
}

并在另一个文件中通过以下方式导入此组件；

import CartoviewDrawer from './cartoview_drawer'

然后我使用这个组件：

React.createElement(AppBar,toolbarOptions,React.createElement(CartoviewDrawer))

但是当我单击图标时，浏览器控制台中出现错误，并且抽屉未出现。 错误：

Uncaught TypeError: Cannot read property 'open' of undefined