单向数据绑定

1.在constructor里注册数据

constructor(){
        super();
        this.title="注册"
 }

2.使用{}进行数据绑定

<h3>{this.title}</h3>

双向数据绑定

1.在constructor里用this.state注册数据

constructor(){
        super();
        this.state={
            user:"",
            pass:"",
            loginSuccess:false
        }
    }

2.使用onChange事件监听数据变化并赋值给this.state

handeChange(item,event){
        for(let StateItem in this.state){
            if(item===StateItem){
                this.state[item]=event.target.value;
                this.setState(this.state)
            }
        }
    }

<div className="input-box">
    <label htmlFor="" >用户名</label><input type="text" onChange={this.handeChange.bind(this,"user")} value={this.state.user}/>
</div>
<div className="input-box">
    <label htmlFor="">密码</label><input type="password" onChange={this.handeChange.bind(this,"pass")} value={this.state.pass}/>
</div>

最后，贴出最终代码

import '../login/login.css';
import './register.css';
class Register extends Component{
    constructor(){
        super();
        this.title="注册"
        this.state={
            user:"",
            pass:"",
            loginSuccess:false
        }
    }
    handeChange(item,event){
        for(let StateItem in this.state){
            if(item===StateItem){
                this.state[item]=event.target.value;
                this.setState(this.state)
            }
        }
    }
    render(){
        return (
            <div className="Register">
                <div className="login-box">
                    <h3>{this.title}</h3>
                    <p></p>
                    <div className="input-box">
                        <label htmlFor="" >用户名</label><input type="text" onChange={this.handeChange.bind(this,"user")} value={this.state.user}/>
                    </div>
                    <div className="input-box">
                        <label htmlFor="">密码</label><input type="password" onChange={this.handeChange.bind(this,"pass")} value={this.state.pass}/>
                    </div>
                    <div style={{textAlign:'center'}}>
                        <button className="login-btn">注册</button>
                    </div>
                </div>
            </div>
        );
    }
}
export default Register;