小库编程教程示范演示-小库网

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>

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>