如何在响应Nodejs中制作或更正PDF数据

npm install pdf-lib

const { PDFDocument } = require('pdf-lib');

async function createPdf() {
  const pdfDoc = await PDFDocument.create();
  const page = pdfDoc.addPage();
  page.drawText('Hello, World!');
  const pdfBytes = await pdfDoc.save();
  return pdfBytes;
}

createPdf().then(pdfBytes => {
  // 处理生成的PDF字节数据
});

const { PDFDocument } = require('pdf-lib');
const fs = require('fs');

async function modifyPdf() {
  const existingPdfBytes = fs.readFileSync('path/to/existing.pdf');
  const pdfDoc = await PDFDocument.load(existingPdfBytes);
  const pages = pdfDoc.getPages();
  const firstPage = pages[0];
  firstPage.drawText('Modified Text', { x: 50, y: 500 });
  const modifiedPdfBytes = await pdfDoc.save();
  return modifiedPdfBytes;
}

modifyPdf().then(modifiedPdfBytes => {
  // 处理修改后的PDF字节数据
});