我想禁用按钮，如果文本框在react中为空

import React, { useState } from 'react';

const MyComponent = () => {
  const [inputValue, setInputValue] = useState('');

  const handleInputChange = (e) => {
    setInputValue(e.target.value);
  };

  const handleSubmit = () => {
    // 处理提交逻辑
  };

  return (
    <div>
      <input type="text" value={inputValue} onChange={handleInputChange} />
      <button disabled={!inputValue} onClick={handleSubmit}>
        提交
      </button>
    </div>
  );
};

export default MyComponent;

import React, { Component } from 'react';

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

  handleInputChange = (e) => {
    this.setState({ inputValue: e.target.value });
  };

  handleSubmit = () => {
    // 处理提交逻辑
  };

  render() {
    const { inputValue } = this.state;

    return (
      <div>
        <input type="text" value={inputValue} onChange={this.handleInputChange} />
        <button disabled={!inputValue} onClick={this.handleSubmit}>
          提交
        </button>
      </div>
    );
  }
}

export default MyComponent;