react 点击变色

import React, { Component } from 'react';
import './reactCss.css'
class App extends Component {
  constructor(props) {
    super(props)
    this.state = {
      list: ['111', '222', '3333'],
      current: 0
    }
  }

  render() {
    return (

      <div >
        <ul>
          {
            this.state.list.map((v, i) => {
              return <li className={this.state.current === i ? 'active' : ''} key={i} onClick={this.changColor.bind(this, i)}>{v}</li>
            })
          }
        </ul>
      </div>
    )
  }
  changColor = (i) => {
    console.log(i)
    this.setState({
      current: i
    })
  }
}


export default App;