前端实现Word、Excel、PDF等文件在线预览方案

import { defaultOptions, renderAsync } from "docx-preview";
renderAsync(buffer, document.getElementById("container"), null,
options: {
       className: string = "docx", // 默认和文档样式类的类名/前缀
       inWrapper: boolean = true, // 启用围绕文档内容渲染包装器
       ignoreWidth: boolean = false, // 禁止页面渲染宽度
       ignoreHeight: boolean = false, // 禁止页面渲染高度
       ignoreFonts: boolean = false, // 禁止字体渲染
       breakPages: boolean = true, // 在分页符上启用分页
       ignoreLastRenderedPageBreak: boolean = true,//禁用lastRenderedPageBreak元素的分页
       experimental: boolean = false, //启用实验性功能（制表符停止计算）
       trimXmlDeclaration: boolean = true, //如果为真，xml声明将在解析之前从xml文档中删除
       debug: boolean = false, // 启用额外的日志记录
   }
);

import * as PDFJS from "pdfjs-dist/legacy/build/pdf";
// 设置pdf.worker.js文件的引入地址
PDFJS.GlobalWorkerOptions.workerSrc = require("pdfjs-dist/legacy/build/pdf.worker.entry.js");
// data是一个ArrayBuffer格式，也是一个buffer流的数据
PDFJS.getDocument(data).promise.then(pdfDoc=>{
    const numPages = pdfDoc.numPages; // pdf的总页数
    // 获取第1页的数据
    pdfDoc.getPage(1).then(page =>{
     // 设置canvas相关的属性
     const canvas = document.getElementById("the_canvas");
     const ctx = canvas.getContext("2d");
     const dpr = window.devicePixelRatio || 1;
     const bsr =
       ctx.webkitBackingStorePixelRatio ||
       ctx.mozBackingStorePixelRatio ||
       ctx.msBackingStorePixelRatio ||
       ctx.oBackingStorePixelRatio ||
       ctx.backingStorePixelRatio ||
       1;
     const ratio = dpr / bsr;
     const viewport = page.getViewport({ scale: 1 });
     canvas.width = viewport.width * ratio;
     canvas.height = viewport.height * ratio;
     canvas.style.width = viewport.width + "px";
     canvas.style.height = viewport.height + "px";
     ctx.setTransform(ratio, 0, 0, ratio, 0, 0);
     const renderContext = {
       canvasContext: ctx,
       viewport: viewport,
     };
     // 数据渲染到canvas画布上
     page.render(renderContext);
    })
})

// 加载excel的数据
（new ExcelJS.Workbook().xlsx.load(buffer)).then(workbook=>{
   // 获取excel的第一页的数据
   const ws = workbook.getWorksheet(1);
   // 获取每一行的数据
   const data = ws.getRows(1, ws.actualRowCount);
 })
// 渲染页面
import { HotTable } from "@handsontable/vue";
<hot-table  :settings="hotSettings"></hot-table>
hotSettings = {
   language: "zh-CN",
   readOnly: true,
   data: this.data,
   cell: this.cell,
   mergeCells: this.merge,
   colHeaders: true,
   rowHeaders: true,
   height: "calc(100vh - 107px)",
   // contextMenu: true,
   // manualRowMove: true,
   // 关闭外部点击取消选中时间的行为
   outsideClickDeselects: false,
   // fillHandle: {
   //   direction: 'vertical',
   //   autoInsertRow: true
   // },
   // afterSelectionEnd: this.afterSelectionEnd,
   // bindRowsWithHeaders: 'strict',
   licenseKey: "non-commercial-and-evaluation"
}