我试图在浏览器中显示PDF，我发现了最受欢迎的图书馆PDF.js。文档和都非常清楚，但是我尝试使用最新的官方版本2.0.943的文档未呈现，但已加载(因为我看到的是正确的页数)，但是看不到。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<!--<script src="//mozilla.github.io/pdf.js/build/pdf.js"></script>-->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/build/pdf.js"></script>
<h1>PDF.js Previous/Next example</h1>
<div>
<button id="prev">Previous</button>
<button id="next">Next</button>
<span>Page: <span id="page_num"></span> / <span id="page_count"></span></span>
</div>
<canvas id="the-canvas"></canvas>
<script>
$(document).ready(function () {
var pdfData = atob(
'JVBERi0xLjcKCjEgMCBvYmogICUgZW50cnkgcG9pbnQKPDwKICAvVHlwZSAvQ2F0YWxvZwog' +
'IC9QYWdlcyAyIDAgUgo+PgplbmRvYmoKCjIgMCBvYmoKPDwKICAvVHlwZSAvUGFnZXMKICAv' +
'TWVkaWFCb3ggWyAwIDAgMjAwIDIwMCBdCiAgL0NvdW50IDEKICAvS2lkcyBbIDMgMCBSIF0K' +
'Pj4KZW5kb2JqCgozIDAgb2JqCjw8CiAgL1R5cGUgL1BhZ2UKICAvUGFyZW50IDIgMCBSCiAg' +
'L1Jlc291cmNlcyA8PAogICAgL0ZvbnQgPDwKICAgICAgL0YxIDQgMCBSIAogICAgPj4KICA+' +
'PgogIC9Db250ZW50cyA1IDAgUgo+PgplbmRvYmoKCjQgMCBvYmoKPDwKICAvVHlwZSAvRm9u' +
'dAogIC9TdWJ0eXBlIC9UeXBlMQogIC9CYXNlRm9udCAvVGltZXMtUm9tYW4KPj4KZW5kb2Jq' +
'Cgo1IDAgb2JqICAlIHBhZ2UgY29udGVudAo8PAogIC9MZW5ndGggNDQKPj4Kc3RyZWFtCkJU' +
'CjcwIDUwIFRECi9GMSAxMiBUZgooSGVsbG8sIHdvcmxkISkgVGoKRVQKZW5kc3RyZWFtCmVu' +
'ZG9iagoKeHJlZgowIDYKMDAwMDAwMDAwMCA2NTUzNSBmIAowMDAwMDAwMDEwIDAwMDAwIG4g' +
'CjAwMDAwMDAwNzkgMDAwMDAgbiAKMDAwMDAwMDE3MyAwMDAwMCBuIAowMDAwMDAwMzAxIDAw' +
'MDAwIG4gCjAwMDAwMDAzODAgMDAwMDAgbiAKdHJhaWxlcgo8PAogIC9TaXplIDYKICAvUm9v' +
'dCAxIDAgUgo+PgpzdGFydHhyZWYKNDkyCiUlRU9G');
// 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 = 'https://cdn.jsdelivr.net/npm/[email protected]/build/pdf.worker.js';
//pdfjsLib.GlobalWorkerOptions.workerSrc = '//mozilla.github.io/pdf.js/build/pdf.worker.js';
// Using DocumentInitParameters object to load binary data.
var loadingTask = pdfjsLib.getDocument({ data: pdfData });
loadingTask.promise.then(function (pdf) {
console.log('PDF loaded');
// Fetch the first page
var pageNumber = 1;
pdf.getPage(pageNumber).then(function (page) {
console.log('Page loaded');
var scale = 1.5;
var viewport = page.getViewport({ scale: scale });
// Prepare canvas using PDF page dimensions
var canvas = document.getElementById('the-canvas');
var context = canvas.getContext('2d');
canvas.height = viewport.height;
canvas.width = viewport.width;
// Render PDF page into canvas context
var renderContext = {
canvasContext: context,
viewport: viewport
};
var renderTask = page.render(renderContext);
renderTask.promise.then(function () {
console.log('Page rendered');
});
});
}, function (reason) {
// PDF loading error
console.error(reason);
});
});
</script>
</body>
</html>
官方示例小提琴:https://jsfiddle.net/pdfjs/wagvs9Lf/?utm_source=website&utm_medium=embed&utm_campaign=wagvs9Lf
我的小提琴(仅版本):https://jsfiddle.net/94x2ozbq/
根据我的了解:
var viewport = page.getViewport({ scale: scale })返回高度和宽度等于NaN的对象 最佳答案
您需要对renderPage()中的以下行进行一些修改，在当前版本中该行需要一个对象，但是在2.0.943中需要一个数字:
从:
var viewport = page.getViewport({scale: scale});
至:
var viewport = page.getViewport(scale);