首先，向flask API发出请求，获取PDF文件作为blob，为blob创建URL，创建锚元素，设置锚元素的href和download属性

调用此函数以下载您的PDF。

async function downloadPDF() {
  // Make a GET request to the Flask API
  const response = await fetch('/api/generate-pdf');

  // Get the PDF file as a blob
  const blob = await response.blob();

  // Create a URL for the blob
  const url = URL.createObjectURL(blob);

  // Create an anchor element
  const a = document.createElement('a');

  // Set the href and download attributes of the anchor element
  a.href = url;
  a.download = 'my-pdf.pdf';

  // Simulate a click on the anchor element
  a.click();

  // Revoke the object URL to release the memory
  URL.revokeObjectURL(url);
}