【React】react双向绑定

import React,{Component} from 'react';


class Todolist extends Component {
    constructor(props) {
        super(props);
        this.state = { 

            username:"111"
        };
    }
    inputChange=(e)=>{
        this.setState({

            username:e.target.value
        })

    }
    setUsername=()=>{
        this.setState({

            username:'李四'
        })

    }
    render() {
        return (
            <div>

                <h2>双休数据绑定</h2>


                {/* model改变影响View    view改变反过来影响model  */}

                <input  value={this.state.username} onChange={this.inputChange}/> 

               <p> {this.state.username}</p>
               
               <button onClick={this.setUsername}>改变username的值</button>


            </div>
        );
    }
}

export default Todolist;