如何在React中使用FilePicker从“react-file-picker”中显示用户上传的PDF？

npm install react-file-picker

import React, { useState } from 'react';
import FilePicker from 'react-file-picker';

const [selectedFile, setSelectedFile] = useState(null);

const handleFileSelect = (file) => {
  setSelectedFile(file);
};

return (
  <div>
    <FilePicker
      extensions={['pdf']}
      onChange={handleFileSelect}
    >
      <button>Select PDF</button>
    </FilePicker>
    {selectedFile && <embed src={URL.createObjectURL(selectedFile)} width="500" height="600" type="application/pdf" />}
  </div>
);