npm install html2canvas
npm install jspdf

import html2Canvas from 'html2canvas';
import JsPDF from 'jspdf';

export default {
 install (Vue, options) {
  Vue.prototype.getPdf = function () {
   var title = this.pdfTitle; // 導出的pdf文件名
   html2Canvas(document.querySelector(this.pdfSelector), { //導出的html元素
    allowTaint: true
   }).then(function (canvas) {
    let contentWidth = canvas.width;
    let contentHeight = canvas.height;
    let pageHeight = contentWidth / 592.28 * 841.89;
    let leftHeight = contentHeight;
    let position = 0;
    let imgWidth = 595.28;
    let imgHeight = 592.28 / contentWidth * contentHeight;
    let pageData = canvas.toDataURL('image/jpeg', 1.0);
    let PDF = new JsPDF('', 'pt', 'a4');
    if (leftHeight < pageHeight) {
     PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
    } else {
     while (leftHeight > 0) {
      PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
      leftHeight -= pageHeight;
      position -= 841.89;
      if (leftHeight > 0) {
       PDF.addPage();
      }
     }
    }
    PDF.save(title + '.pdf');
   })
  }
 }
}

<template>
 <div id="pdfPrint">
    <!-- 調用getPdf方法 -->
    <el-button @click="getPdf('#pdfPrint')">保存為PDF</el-button>
 </div>
</template>

<script>
export default {
 data() {
  return {
   // 填入導出的pdf文件名和html元素
   pdfTitle: '因子評價報告',
   pdfSelector: '#pdfPrint',
  }
 },