允许在不更新状态的情况下在React控制的输入中使用空值

class MyForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      inputValue: '' // 初始为空值
    };
  }

  handleChange(event) {
    this.setState({ inputValue: event.target.value });
  }

  handleSubmit(event) {
    event.preventDefault();
    // 处理表单提交逻辑
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <input
          type="text"
          value={this.state.inputValue}
          onChange={this.handleChange}
        />
        <button type="submit">提交</button>
      </form>
    );
  }
}

class MyForm extends React.Component {
  constructor(props) {
    super(props);
    this.inputRef = React.createRef();
  }

  handleSubmit(event) {
    event.preventDefault();
    const inputValue = this.inputRef.current.value;
    // 处理表单提交逻辑
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <input type="text" defaultValue="" ref={this.inputRef} />
        <button type="submit">提交</button>
      </form>
    );
  }
}