react中的受控组件与非受控组件
非受控组件：现用现取
<!DOCTYPE html>
<html><head><meta charset="UTF-8" /><title>react中的受控组件与非受控组件</title><script src="https://unpkg.com/react@18/umd/react.development.js"></script><script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script><script src="https://unpkg.com/@babel/standalone@7/babel.min.js"></script><script src="https://unpkg.com/prop-types@15.8.1/prop-types.js"></script>
</head><body><div id="root"></div><script type="text/babel">const root = ReactDOM.createRoot(document.getElementById('root'));class MyComponent extends React.Component {sevaDate = (e) => {const { name, password } = this;alert(`用户名：${name.value}，密码：${password.value}`);}render() {return (<form onSubmit={this.sevaDate}><input type="text" ref={c => this.name = c}></input><input type="password" ref={c => this.password = c}></input><button type="submit">提交</button></form>);}};root.render(<MyComponent />);</script>
</body></html>受控组件
类似于vue中的数据双向绑定
<!DOCTYPE html>
<html><head><meta charset="UTF-8" /><title>react中的受控组件与非受控组件</title><script src="https://unpkg.com/react@18/umd/react.development.js"></script><script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script><script src="https://unpkg.com/@babel/standalone@7/babel.min.js"></script><script src="https://unpkg.com/prop-types@15.8.1/prop-types.js"></script>
</head><body><div id="root"></div><script type="text/babel">const root = ReactDOM.createRoot(document.getElementById('root'));class MyComponent extends React.Component {state = {name: '',password: ''}sevaDate = (e) => {e.preventDefault();// 阻止表单提交的默认行为alert(`用户名：${this.name}，密码：${this.password}`);}sevaName = (e) => {this.name = e.target.value; // 将输入框的值赋值给state中的name}sevaPassword = (e) => {this.password = e.target.value; // 将输入框的值赋值给state中的password}render() {return (<form onSubmit={this.sevaDate}><input type="text" onChange={this.sevaName}></input><input type="password" onChange={this.sevaPassword}></input><button type="submit">提交</button></form>);}};root.render(<MyComponent />);</script>
</body></html>总结
尽量少写非受控组件因为受控组件里一个ref都没有（官方建议少用ref）