react中输入为空时禁用按钮

state = {
  inputValue: '',
  isButtonDisabled: true
};

handleChange = (event) => {
  const inputValue = event.target.value;
  const isButtonDisabled = inputValue === '';

  this.setState({
    inputValue,
    isButtonDisabled
  });
};

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

  return (
    <div>
      <input type="text" value={inputValue} onChange={this.handleChange} />
      <button disabled={isButtonDisabled}>提交</button>
    </div>
  );
}