React style变量问题

React style变量的问题

import {Component} from 'react'
class Parent extends Component {
    constructor() {
        super()
        this.state = {
            color: 'red'
        }
    }
    changeColor = () => {
        this.setState({
            color: 'blue'
        })
    }
    render() {
        return (
            <div>
               <div style={ {color: this.state.color} } onClick={this.changeColor}>点击</div>
            </div>
        )
    }
}