pdfjs预览pdf文件的两种方式（可复制）

1.以图片形式进行展示：

version：采用1.x版本，2.0版本会有字体显示不完整的问题：参考

这里使用1.8.170

 <script th:src="@{/pdfjs/build/pdf.js}"></script>//导入pdfjs

　　

<div class="grid-content bg-purple" style="height: 660px;">
<div align="center">
  <el-button id="prev" type="primary">上一页</el-button>
   <span>页数: <span id="page_num"></span> / <span id="page_count"></span></span>
    <el-button id="next" type="primary">下一页</el-button>
</div>
<div align="center">
 <canvas id="the-canvas" style="border:1px solid black;width:100%;"></canvas>
</div>
</div>

 pdfView(row) {
                PDFJS.workerSrc =[[@{/pdfjs/build/pdf.worker.js}]];//加载核心库
                PDFJS.cMapUrl = [[@{/pdfjs/web/cmaps/}]];
                PDFJS.cMapPacked = true;
                var url = 'http://****server***:11087/ciserveradmin/invoicePrint/d?invoiceId=10002047';
                // var url = [[@{/invoicePrint/d?invoiceId}]]+'='+row.invoice_id;
                var pdfDoc = null,
                    pageNum = 1,
                    pageRendering = false,
                    pageNumPending = null,
                    scale = 2.6, //清晰度不清晰 可调整该值
                    canvas = document.getElementById('the-canvas'),
                    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);
                        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 = pageNum;
                }

                /**
                 * 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.
                 */
                PDFJS.getDocument(url).then(function (pdfDoc_) {
                    pdfDoc = pdfDoc_;
                    document.getElementById('page_count').textContent = pdfDoc.numPages;

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

2.采用pdfjs内部的viewer.html进行调用，可进行复制粘贴打印下载等功能

这里如果涉及到pdf源文件跨域的话，可修改viewer.js文件，注释

 var fileOrigin = new URL(file, window.location.href).origin;
   /* if (fileOrigin !== viewerOrigin) {
      throw new Error('file origin does not match viewer\'s');
    }*/

<div class="grid-content bg-purple" style="height: 660px;">
   <iframe  width="100%" height="100%" id="the-canvas" style="border:1px solid black;width:100%;"></iframe>
 </div>

pdfView(){
                var pdfurl = 'http://**server**:8080/ciserveradmin/invoicePrint/d?invoiceId=1000247';
                var url =[[@{/pdfjs/web/viewer.html?file=}]]+encodeURIComponent(pdfurl);
                // var url = [[@{/invoicePrint/d?invoiceId}]]+'='+row.invoice_id;
                $('#the-canvas').attr('src',url);
            },