class TodoApp extends React.Component { constructor(props) { super(props); this.handleChange = this.handleChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); this.state = {items: [], text: ''}; } render() { return (); } handleChange(e) { this.setState({text: e.target.value}); } handleSubmit(e) { e.preventDefault(); var newItem = { text: this.state.text, id: Date.now() }; this.setS