楼上的兄弟，帮你格式化一下代码，看的难受
import React, { Component } from 'react';import ReactDOM from 'react-dom';var EventEmitter = require('events').EventEmitter;let emitter = new EventEmitter();class ListItem extends Component { static defaultProps = { checked: false }; constructor(props) { super(props); } render () { return ( <li> <input type="checkbox" checked={this.props.checked} onChange={this.props.onChange} /> <span>{this.props.value}</span> </li> ); }}class List extends Component { constructor(props) { super(props); this.state = { list: this.props.list.map(entry => ({ text: entry.text, checked: entry.checked || false })) }; console.log(this.state); } onItemChange (entry) { const { list } = this.state; this.setState({ list: list.map(prevEntry => ({ text: prevEntry.text, checked: prevEntry.text === entry.text ? !prevEntry.checked : prevEntry.checked })) }); //这里触发事件 emitter.emit('ItemChange', entry); } render () { return ( <div> <ul> {this.state.list.map((entry, index) => { return ( <ListItem key={`list - ${index}`} value={entry.text} checked={entry.checked} onChange={this.onItemChange.bind(this, entry)} /> ); })} </ul> </div> ); }}class App extends Component { constructor(props) { super(props); } componentDidMount () { this.itemChange = emitter.addListener('ItemChange', (msg, data) => console.log(msg));//注册事件 } componentWillUnmount () { emitter.removeListener(this.itemChange);//取消事件 } render () { return ( <List list={[{ text: 1 }, { text: 2 }]} /> ) }}ReactDOM.render( <App />, document.getElementById('root'));
