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<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>菜鸟教程 React 实例</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/react/18.2.0/umd/react.production.min.js" ></script> <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/react-dom/18.2.0/umd/react-dom.production.min.js"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/babel-standalone/6.26.0/babel.min.js" ></script> </head> <body> <div id="root"></div> <script type="text/babel"> class FlavorForm extends React.Component { constructor(props) { super(props); this.state = {value: 'coconut'}; this.handleChange = this.handleChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); } handleChange(event) { this.setState({value: event.target.value}); } handleSubmit(event) { alert('Your favorite flavor is: ' + this.state.value); event.preventDefault(); } render() { return ( <form onSubmit={this.handleSubmit}> <label> 选择您最喜欢的网站 <select value={this.state.value} onChange={this.handleChange}> <option value="gg">Google</option> <option value="rn">Runoob</option> <option value="tb">Taobao</option> <option value="fb">Facebook</option> </select> </label> <input type="submit" value="提交" /> </form> ); } } const root = ReactDOM.createRoot(document.getElementById("root")); root.render( <FlavorForm /> ); </script> </body> </html>
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