如何获取当前滚动元素key - React PDF

import { Document, Page } from 'react-pdf';

state = {
  currentPage: null
};

render() {
  return (
    <div>
      <Document
        file="your-pdf-file.pdf"
        onLoadSuccess={({ numPages }) => {
          this.setState({ currentPage: 1 }); // 设置初始滚动元素的key为1
        }}
      >
        <Page pageNumber={this.state.currentPage} />
      </Document>
    </div>
  );
}

render() {
  return (
    <div>
      <Document
        file="your-pdf-file.pdf"
        onLoadSuccess={({ numPages }) => {
          this.setState({ currentPage: 1 });
        }}
      >
        <Page
          pageNumber={this.state.currentPage}
          onPageChange={({ pageNumber }) => {
            this.setState({ currentPage: pageNumber });
          }}
        />
      </Document>
    </div>
  );
}