如何向react-select添加add键？

npm install react-select

import React from 'react';
import Select from 'react-select';

class CustomSelect extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      options: props.options,
      selectedOption: null,
    };
  }

  handleAddOption = (newValue) => {
    const { options } = this.state;
    const newOption = { value: newValue, label: newValue };
    const updatedOptions = [...options, newOption];
    this.setState({ options: updatedOptions, selectedOption: newOption });
  };

  handleChange = (selectedOption) => {
    this.setState({ selectedOption });
  };

  render() {
    const { options, selectedOption } = this.state;

    return (
      <div>
        <Select
          options={options}
          value={selectedOption}
          onChange={this.handleChange}
        />
        <button onClick={() => this.handleAddOption('add')}>Add</button>
      </div>
    );
  }
}

export default CustomSelect;

import React from 'react';
import CustomSelect from './CustomSelect';

class App extends React.Component {
  render() {
    const options = [
      { value: 'option1', label: 'Option 1' },
      { value: 'option2', label: 'Option 2' },
    ];

    return (
      <div>
        <CustomSelect options={options} />
      </div>
    );
  }
}

export default App;