vue前端html导出pdf

package.json中添加依赖

调用方：

import htmlToPdf from '../../../utils/file/htmlToPdf.js'// 下载方法，pdfDownloadDpi为onClickDownLoad(){
      htmlToPdf.getPdf('标题1','jsfgyzcpgxmShow', this.pdfDownloadDpi)}

htmlToPdf.js

// 页面导出为pdf格式
import html2Canvas from 'html2canvas'
import jsPDF from 'jspdf'const htmlToPdf ={getPdf(title, url, dpi, fn){
    var divId =''if(url ==='gyzcpgxmShow'){
      divId ='#pdfDom'}if(url ==='jsfgyzcpgxmShow'){
      divId ='#pdfDom2'}if(url ==='stockRelation'){
      divId ='#stockRelationBody'}html2Canvas(document.querySelector(divId),{
      allowTaint: false,
      taintTest: false,
      logging: false,
      useCORS: true,
      dpi: window.devicePixelRatio * dpi,// 将分辨率提高到特定的DPI 提高四倍 【1： 0.4M左右, 2: 1000K 左右, 3: 2.1M , 4：3M 左右】
      scale: dpi // 按比例增加分辨率}).then(canvas =>{// eslint-disable-next-line new-cap
      var pdf = new jsPDF('l','mm','a3')// A3纸，横向// var pdf = new jsPDF('p', 'mm', 'a4') // A4纸，纵向
      var ctx = canvas.getContext('2d')// var a4w = 190; var a4h = 277 // A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277// var a4w = 259; var a4h = 400
      var a4w =286; var a4h =420// A3大小，279mm x 420mm，四边各保留10mm的边距，显示区域259x400// var imgHeight = Math.floor(a4h * canvas.width / a4w) // 按A4显示比例换算一页图像的像素高度[这个计算方式应该是纵向]
      var imgHeight = Math.floor(a4w * canvas.width / a4h)// 按A4显示比例换算一页图像的像素高度[这个是横向打印的计算方法]
      var renderedHeight =0while(renderedHeight < canvas.height){
        var page = document.createElement('canvas')
        page.width = canvas.width
        page.height = Math.min(imgHeight, canvas.height - renderedHeight)// 可能内容不足一页// 用getImageData剪裁指定区域，并画到前面创建的canvas对象中
        page.getContext('2d').putImageData(ctx.getImageData(0, renderedHeight, canvas.width, Math.min(imgHeight, canvas.height - renderedHeight)),0,0)// pdf.addImage(page.toDataURL('image/jpeg', 1.0), 'JPEG', 10, 10, a4w, Math.min(a4h, a4w * page.height / page.width)) // 添加图像到页面，保留10mm边距 [a4使用]
        pdf.addImage(page.toDataURL('image/jpeg',1.0),'JPEG',10,10, a4w *1.414, Math.min(a4h, a4w * page.height / page.width)*1.414)// 添加图像到页面，保留10mm边距[a3使用1.414换算比例]

        renderedHeight += imgHeight
        if(renderedHeight < canvas.height){
          pdf.addPage()// 如果后面还有内容，添加一个空页}// delete page;}// 保存文件
      pdf.save(title +'.pdf')}).catch(res =>{ console.log(res)}).finally(()=>{if(fn){fn()}})}}

export default htmlToPdf