浅谈React双向数据绑定原理

import React, { Component } from 'react';
// 引入 antd UI库
import { Button } from 'antd';  
class Home extends Component {
    constructor(props) {
        super(props);
        this.state = { 
            inputVal:'',
         };
    }   
    setValue=()=>{
        this.setState({
            inputVal:"修改 Value"
        })
    }
    render() {
        return (
            <div className="home" >
                Home组件
                <p> {this.state.inputVal}</p>
                 {/* 使用了 antd UI库 */}
                <Button type="primary" onClick={this.setValue}>修改数据</Button>
            </div>
        );
    }
}
export default Home;

import React, { Component } from 'react';
import { Button } from 'antd'; // antd UI库
class Home extends Component {
    constructor(props) {
        super(props);
        this.state = { 
            inputVal:'',
         };

    }    
    change = (ev)=>{
        this.setState({
            inputVal:ev.target.value
        })
    }
    render() {
        return (
            <div className="home" >
                Home组件
				<input 
                    onChange={this.change}
                    // value={this.state.inputVal}
                    defaultValue={this.state.inputVal}
                    placeholder="输入文本内容"
                 />
                <p>&emsp;{this.state.inputVal}</p>
            </div>
        );
    }
}
export default Home;