更改<select>上的值时的setState

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      selectedValue: ''
    };
  }

  handleSelectChange = (event) => {
    this.setState({ selectedValue: event.target.value });
  }

  render() {
    return (
      <div>
        <select value={this.state.selectedValue} onChange={this.handleSelectChange}>
          <option value="option1">Option 1</option>
          <option value="option2">Option 2</option>
          <option value="option3">Option 3</option>
        </select>
      </div>
    );
  }
}