import React,{ PureComponent } from 'react';

class MyComponent extends PureComponent {
  constructor(props) {
    super(props);
    this.myRef = React.createRef();
    console.log(this.myRef);
  }

  componentDidMount() {
    console.log(this.myRef);
  }

  componentWillUnmount() {
    console.log('unmounting');
  }

  render() {
    console.log(this.myRef);
    return (
      <div ref={this.myRef}>
        foobar
      </div>
    );
  }
}

安慰：

{current: null}
{current: null}
{current: null}

我在React 16.3上.我错过了什么？