pdf.js – 引用错误：未定义PDFJS

我正在尝试使用pdf.js将pdf加载到Web应用程序中,以便我可以进一步从pdf文件中提取信息.但是我用一个非常小的例子得到了这个错误.

我已经尝试将代码包装在$(document).ready()中,如Uncaught ReferenceError: PDFJS is not defined when initialising PDF.JS所示

我也无法在控制台中访问PDFJS.

以下是我正在使用的代码(从https://www.sitepoint.com/custom-pdf-rendering/开始)

<!DOCTYPE html>
<html>
  <head>
    <Meta charset="utf-8"/>
    <title>PDF.js Learning</title>
  </head>
  <body>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script type="text/javascript" src="https://mozilla.github.io/pdf.js/build/pdf.js"></script>
    <script type="text/javascript" src="https://mozilla.github.io/pdf.js/build/pdf.worker.js"></script>
    <script>
    $(document).ready(function () {
    var url = "https://github.com/mozilla/pdf.js/blob/master/web/compressed.tracemonkey-pldi-09.pdf";

// Asynchronous download PDF
PDFJS.getDocument(url)
  .then(function(pdf) {
    return pdf.getPage(1);
  })
  .then(function(page) {
    // Set scale (zoom) level
    var scale = 1.5;

    // Get viewport (dimensions)
    var viewport = page.getViewport(scale);

    // Get canvas#the-canvas
    var canvas = document.getElementById('the-canvas');

    // Fetch canvas' 2d context
    var context = canvas.getContext('2d');

    // Set dimensions to Canvas
    canvas.height = viewport.height;
    canvas.width = viewport.width;

    // Prepare object needed by render method
    var renderContext = {
      canvasContext: context,viewport: viewport
    };

    // Render PDF page
    page.render(renderContext);
  });
  })
  </script>
  <canvas id='the-canvas'></canvas>
  </body>
</html>

解决方法

pdfjsLib.getDocument()有效.现在我只需要知道为什么……

pdf.js – 引用错误：未定义PDFJS

解决方法

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