我正在嘗試使用pdf.js從pdf渲染頁(yè)面通常，使用網(wǎng)址，我可以這樣做：PDFJS.getDocument("http://www.server.com/file.pdf").then(function getPdfHelloWorld(pdf) {  //  // Fetch the first page  //  pdf.getPage(1).then(function getPageHelloWorld(page) {    var scale = 1.5;    var viewport = page.getViewport(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    //    page.render({canvasContext: context, viewport: viewport});  });});但在這種情況下，我將文件放在base64而不是url：data:application/pdf;base64,JVBERi0xLjUKJdDUxdgKNSAwIG9iaiA8PAovTGVuZ3RoIDE2NjUgICAgICAKL0ZpbHRlciAvRmxhdGVEZWNvZGUKPj4Kc3RyZWFtCnjarVhLc9s2...怎么做到這一點(diǎn)？