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前端使用pdf-lib库实现pdf合并，window.open预览合并后的pdf

news 2025/8/26 0:57:02

最近出差开了好多发票，写了一个pdf合并网站，用于把多张发票pdf合并成一张，方便打印

使用pdf-lib这个库实现的pdf合并功能，预览使用的是浏览器自身查看pdf功能
源码

网页地址 https://zqy233.github.io/PDF-merge/

<!DOCTYPE html>
<html><head><title>PDF合并</title><script src="https://cdn.jsdelivr.net/npm/pdf-lib@1.17.1/dist/pdf-lib.min.js"></script></head><body><input type="file" id="fileInput" multiple /><button onclick="previewMergePDF()">预览合并的PDF</button><button onclick="downloadMergePDF()">下载合并的PDF</button><script>async function previewMergePDF() {const fileInput = document.getElementById("fileInput");const files = fileInput.files;if (files.length < 2) {alert("请至少选择两个PDF文件进行合并！");return;}// 创建一个新的PDF文档const mergedPdf = await PDFLib.PDFDocument.create();// 遍历选择的每个文件for (let i = 0; i < files.length; i++) {const file = files[i];const reader = new FileReader();// 读取文件内容const fileContents = await new Promise((resolve, reject) => {reader.onload = function (event) {resolve(event.target.result);};reader.onerror = function (event) {reject(new Error("文件读取错误。"));};reader.readAsArrayBuffer(file);});// 将PDF文件添加到合并的PDF文档中const pdf = await PDFLib.PDFDocument.load(fileContents);const copiedPages = await mergedPdf.copyPages(pdf,pdf.getPageIndices());copiedPages.forEach((page) => {mergedPdf.addPage(page);});}// 使用浏览器自带预览功能，预览合并后的PDFconst mergedPdfBytes = await mergedPdf.save();const mergedPdfBlob = new Blob([mergedPdfBytes], {type: "application/pdf",});const fileURL = URL.createObjectURL(mergedPdfBlob);window.open(fileURL);}async function downloadMergePDF() {const fileInput = document.getElementById("fileInput");const files = fileInput.files;if (files.length < 2) {alert("请至少选择两个PDF文件进行合并！");return;}const mergedPdf = await PDFLib.PDFDocument.create();for (let i = 0; i < files.length; i++) {const file = files[i];const reader = new FileReader();const fileContents = await new Promise((resolve, reject) => {reader.onload = function (event) {resolve(event.target.result);};reader.onerror = function (event) {reject(new Error("文件读取错误。"));};reader.readAsArrayBuffer(file);});const pdf = await PDFLib.PDFDocument.load(fileContents);const copiedPages = await mergedPdf.copyPages(pdf,pdf.getPageIndices());copiedPages.forEach((page) => {mergedPdf.addPage(page);});}const mergedPdfFile = await mergedPdf.saveAsBase64();const downloadLink = document.createElement("a");downloadLink.href = "data:application/pdf;base64," + mergedPdfFile;downloadLink.download = "merged.pdf";downloadLink.click();}</script></body>
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