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javascript - PDF 查看器适用于 VS Code Live Code Server，但不适用于我的本地计算机 pdf.js

问题描述

我正在尝试制作一个 PDF 查看器，当我通过 vscode 上的实时服务器运行它时它运行完美，但由于某种原因，当我转到我的文件时，右键单击 index.html 并单击用 chrome、firefox 打开，或 Internet Explorer 出现 2 个错误：

1）获取文件：//mozilla.github.io/pdf.js/build/pdf.js net::ERR_FILE_NOT_FOUND main.js:18 2）未捕获的类型错误：无法读取 main.js:18 处未定义的属性“GlobalWorkerOptions”

这是我的 index.html 代码和 main.js 代码：

索引.html

<!DOCTYPE html>
<html>
<head>
    <title>PDF Viewer Attempt 2</title>
    <link rel="stylesheet" href="css/style.css">
</head>

<body>
    <h1>PDF Name</h1>

    <div>
    <button id="prev">Previous</button>
    <button id="next">Next</button>
    &nbsp; &nbsp;


    <span>Page: <span id="page_num"></span> / <span id="page_count"></span></span>
    </div>

    <canvas id="the-pdf"></canvas>

    <script src="//mozilla.github.io/pdf.js/build/pdf.js"></script>
    <script src="js/main.js"></script>
</body>
</html>

main.js: //代码改编自https://jsfiddle.net/pdfjs/wagvs9Lf/

// If absolute URL from the remote server is provided, configure the CORS
// header on that server.
var url = 'https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/web/compressed.tracemonkey-pldi-09.pdf'; //works with this internet pdf
//url = 'pdf.pdf'; // Works with local pdf



// Loaded via <script> tag, create shortcut to access PDF.js exports.
var pdfjsLib = window['pdfjs-dist/build/pdf'];


// The workerSrc property shall be specified.
pdfjsLib.GlobalWorkerOptions.workerSrc = '//mozilla.github.io/pdf.js/build/pdf.worker.js';

var pdfDoc = null,
    pageNum = 1,
    pageRendering = false,
    pageNumPending = null,
    scale = 0.8,
    canvas = document.getElementById('the-pdf'),
    ctx = canvas.getContext('2d');

/**
 * Get page info from document, resize canvas accordingly, and render page.
 * @param num Page number.
 */
function renderPage(num) {
  pageRendering = true;
  // Using promise to fetch the page
  pdfDoc.getPage(num).then(function(page) {
    var viewport = page.getViewport({scale: scale});
    canvas.height = viewport.height;
    canvas.width = viewport.width;

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

    // Wait for rendering to finish
    renderTask.promise.then(function() {
      pageRendering = false;
      if (pageNumPending !== null) {
        // New page rendering is pending
        renderPage(pageNumPending);
        pageNumPending = null;
      }
    });
  });

  // Update page counters
  document.getElementById('page_num').textContent = num;
}

/**
 * If another page rendering in progress, waits until the rendering is
 * finised. Otherwise, executes rendering immediately.
 */
function queueRenderPage(num) {
  if (pageRendering) {
    pageNumPending = num;
  } else {
    renderPage(num);
  }
}

/**
 * Displays previous page.
 */
function onPrevPage() {
  if (pageNum <= 1) {
    return;
  }
  pageNum--;
  queueRenderPage(pageNum);
}
document.getElementById('prev').addEventListener('click', onPrevPage);

/**
 * Displays next page.
 */
function onNextPage() {
  if (pageNum >= pdfDoc.numPages) {
    return;
  }
  pageNum++;
  queueRenderPage(pageNum);
}
document.getElementById('next').addEventListener('click', onNextPage);

/**
 * Asynchronously downloads PDF.
 */
pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) {
  pdfDoc = pdfDoc_;
  document.getElementById('page_count').textContent = pdfDoc.numPages;

  // Initial/first page rendering
  renderPage(pageNum);
});

任何帮助表示赞赏！这是我的第一篇文章，所以如果有什么我可以做的更好的格式，请告诉我！暂时不要担心那条显示错误的行，那只是一个段落块。

标签： javascripthtmlpdfvisual-studio-codepdf.js

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