NodeJS：使用通过读取文件获得的缓冲区将两个PDF文件合并为一个文件

HummusJS支持使用其appendPDFPagesFromPDF方法合并PDF

使用流与缓冲区一起使用的示例：

const hummus = require('hummus');const memoryStreams = require('memory-streams');const combinePDFBuffers = (firstBuffer, secondBuffer) => {    var outStream = new memoryStreams.WritableStream();    try {        var firstPDFStream = new hummus.PDFRStreamForBuffer(firstBuffer);        var secondPDFStream = new hummus.PDFRStreamForBuffer(secondBuffer);        var pdfWriter = hummus.createWriterToModify(firstPDFStream, new hummus.PDFStreamForResponse(outStream));        pdfWriter.appendPDFPagesFromPDF(secondPDFStream);        pdfWriter.end();        var newBuffer = outStream.toBuffer();        outStream.end();        return newBuffer;    }    catch(e){        outStream.end();        throw new Error('Error during PDF combination: ' + e.message);    }};combinePDFBuffers(PDFBuffer1, PDFBuffer2);