从react中的输入获取默认值

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

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

  render() {
    return (
      <form>
        <input
          type="text"
          defaultValue={this.state.inputValue}
          onChange={this.handleChange}
        />
      </form>
    );
  }
}

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

  componentDidMount() {
    console.log(this.inputRef.current.value);
  }

  render() {
    return (
      <form>
        <input
          type="text"
          ref={this.inputRef}
          defaultValue="Default Value"
        />
      </form>
    );
  }
}