不使用select和onChange处理程序更新组件的状态

import React, { useState } from 'react';

function MyComponent() {
  const [value, setValue] = useState('');

  const handleClick = () => {
    setValue('New Value');
  };

  return (
    <div>
      <p>{value}</p>
      <button onClick={handleClick}>Update Value</button>
    </div>
  );
}

import React, { Component } from 'react';

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

  handleClick = () => {
    this.setState({ value: 'New Value' });
  };

  render() {
    return (
      <div>
        <p>{this.state.value}</p>
        <button onClick={this.handleClick}>Update Value</button>
      </div>
    );
  }
}