如何在react- to -print中打印整个页面

npm install react-to-print --save

import React from 'react';
import ReactToPrint from 'react-to-print';

class PrintableComponent extends React.Component {
  render() {
    return (
      <div>
        {/* 打印的页面内容 */}
      </div>
    );
  }
}

class PrintButton extends React.Component {
  render() {
    return (
      <div>
        <ReactToPrint
          trigger={() => <button>打印</button>}
          content={() => this.componentRef}
        />
        <PrintableComponent ref={el => (this.componentRef = el)} />
      </div>
    );
  }
}

export default PrintButton;