PDF.js 2.0.943不能在浏览器中呈现PDF

<script src="pdf.js"></script>
<script src="pdf.worker.js"></script>

const url = 'path/to/your/pdf-file.pdf';
pdfjsLib.getDocument(url).promise.then(function(pdf) {
  // Your code to render the PDF
});

const pageNumber = 1;
pdf.getPage(pageNumber).then(function(page) {
  const scale = 1.5;
  const viewport = page.getViewport({ scale: scale });

  // Prepare the canvas using the current page number and viewport
  const canvas = document.getElementById('pdf-canvas');
  const context = canvas.getContext('2d');
  canvas.height = viewport.height;
  canvas.width = viewport.width;

  // Render PDF page into canvas context
  const renderContext = {
    canvasContext: context,
    viewport: viewport
  };
  page.render(renderContext);
});