在react.js中点击按钮时如何读取按钮中的值字段

constructor(props) {
  super(props);
  this.state = {
    buttonValue: '初始值'
  };
}

render() {
  return (
    <button value={this.state.buttonValue} onClick={this.handleClick}>点击按钮</button>
  );
}

handleClick = (event) => {
  const buttonValue = event.target.value;
  console.log(buttonValue); // 打印按钮的值字段
}

import React, { Component } from 'react';

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

  handleClick = (event) => {
    const buttonValue = event.target.value;
    console.log(buttonValue); // 打印按钮的值字段
  }

  render() {
    return (
      <button value={this.state.buttonValue} onClick={this.handleClick}>点击按钮</button>
    );
  }
}

export default MyComponent;