CORS 政策错误

我有一个用 asp.net mvc 制作的网站，其中我必须有一个 pdf 查看器，我选择选择Mozilla一个，但是在查看 pdf 时出现以下错误：

从源“ http://localhost:57130 ”访问“file:///C:Ruta/pdf/pdf_example4.pdf”的XMLHttpRequest已被 CORS 策略阻止：跨源请求仅支持协议方案：http，数据，铬，铬扩展，https。

我看过这个解决方案，但它似乎对你的问题非常具体，将东西添加到我没有的类中。

我用来调用pdf的代码是：

function cargarPdf(ruta) {
            // If absolute URL from the remote server is provided, configure the CORS
            // header on that server.

            var url = ruta;


            // Loaded via <script> tag, create shortcut to access PDF.js exports.
            var pdfjsLib = window['pdfjs-dist/build/pdf'];
            //console.log(pdfjsLib);
            // The workerSrc property shall be specified.
            pdfjsLib.GlobalWorkerOptions.workerSrc = '../Public/js/PDFJS/pdf.worker.js';

            var pdfDoc = null,
                pageNum = 1,
                pageRendering = false,
                pageNumPending = null,
                scale = 0.65,
                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: 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);
            });
        }

执行此代码时出现两个错误：

错误 1 ​​pdf.js:23842 Uncaught TypeError: Cannot read property 'xhr' of undefined at NetworkManager.getRequestXhr (pdf.js:23842) at PDFNetworkStreamFullRequestReader._onHeadersReceived (pdf.js:23969) at NetworkManager.onStateChange (pdf.js:23779) ) 在 NetworkManager.request (pdf.js:23751) 在 NetworkManager.requestFull (pdf.js:23707) 在新 PDFNetworkStreamFullRequestReader (pdf.js:23944) 在 PDFNetworkStream.getFullReader (pdf.js:23897) 在 WorkerTransport。(pdf.js:11495) at _callee$ (pdf.js:16870) at tryCatch (pdf.js:12428)

错误 2: pdf.js:24035 Uncaught TypeError: Cannot read property 'reject' of undefined at PDFNetworkStreamFullRequestReader._onError (pdf.js:24035) at XMLHttpRequest.xhr.onerror (pdf.js:23741) at NetworkManager.request (pdf. js:23751) 在 NetworkManager.requestFull (pdf.js:23707) 在新 PDFNetworkStreamFullRequestReader (pdf.js:23944) 在 PDFNetworkStream.getFullReader (pdf.js:23897) 在 WorkerTransport。(pdf.js:11495) at _callee$ (pdf.js:16870) at tryCatch (pdf.js:12428) at Generator.invoke [as _invoke] (pdf.js:12603)

如果我使用从网络编写的路径将字符串作为参数传递给 loadPdf 函数，它会显示 pdf，但是从数据库中收集路径时，会弹出错误。