前端js实现把网页导出为pdf

前段时间遇到一个需求，产品说需要把当前页面，点击导出按钮，导出为pdf，所以就有了以下代码：
部分来自于官方直连GPT4o

import $ from "jquery"; import html2canvas from 'html2canvas'; import jsPDF from 'jspdf'  export default {     data () {         return {}     },     mounted() {              },     methods: {         formatterPdfElement($dom) {             var $copyElement = $dom.cloneNode(true);             document.querySelector('.export-preview-container').appendChild($copyElement);             this.visiblePreview = true;             this.$nextTick(() => {                 var results = [{                     position: 0,                     height: 0                 }];                 var pageOffsetTop = $copyElement.offsetTop;                 var pageOffsetWidth = $copyElement.offsetWidth;                 // var $unitElements = $($copyElement).find('.minimum-unit'); // 遍历所有子元素不可取，应只遍历第一层子元素                 var $unitElements = $($copyElement).children(); // 遍历所有子元素不可取，应只遍历第一层子元素                 var perPageHeight = pageOffsetWidth / 595.28 * 841.89;                 let tHeight = perPageHeight;                 let insertList = [];                 $unitElements.each((index, $element) => {                     console.log(tHeight, 'tHeight');                     console.log($($element), $($element).outerHeight(true));                     tHeight -= $($element).outerHeight(true);                     if (tHeight < 0) {                         let remainHeight = parseInt(tHeight + $($element).outerHeight(true) + 30);                         tHeight = perPageHeight - $($element).outerHeight(true);                         let obj = {index, remainHeight};                         insertList.push(obj);                     }                 });                 insertList.forEach((dif, index) => {                     let remHeight = dif.remainHeight;                     let domObj = document.createElement("div");                     domObj.innerHTML = "";                     domObj.setAttribute("style", `width:100%;height:${remHeight}px`)                     console.log('$unitElements[dif.index] :>> ', $unitElements[dif.index]);                     $unitElements[dif.index].before(domObj);                 })                 console.log($copyElement, "241");                 // return                  var pdf = new jsPDF('', 'pt', 'a4');                 html2canvas($copyElement, {                     useCORS: true,                     scale: 2,                     allowTaint: true,                     background: '#f0f4f7',                     ignoreElements: (element) => {                         if (element.className.indexOf('top-btns') > -1) {                             return true;                         }                         return false;                     }                 }).then(canvas => {                     var contentWidth = canvas.width;                     var contentHeight = canvas.height;                     var pageHeight = contentWidth / 592.28 * 841.89;                     var leftHeight = contentHeight;                     var position = 0;                     var imgWidth = 592.28;                     var imgHeight = 592.28 / contentWidth * contentHeight;                     if (leftHeight < pageHeight) {                         pdf.addImage(canvas.toDataURL('image/jpeg', 1), 'JPEG', 0, position, imgWidth, imgHeight)                     } else {                         while (leftHeight > 0) {                             pdf.addImage(canvas.toDataURL('image/jpeg', 1), 'JPEG', 0, position, imgWidth, imgHeight);                             leftHeight -= pageHeight;                             position -= 841.89;                             if (leftHeight > 0) {                                 pdf.addPage();                             }                         }                     }                 }).then(() => {                     const name = `${this.reportInfo.devPath}-${this.reportInfo.startDtm}~${this.reportInfo.endDtm}`;                     pdf.internal.scaleFactor = 1.33;                     pdf.save(`${name}.pdf`);                     this.isExporting = false;                     this.visiblePreview = false;                 });             })         },         exportReport() {             var content = document.querySelector('.mian-box-contain');             this.formatterPdfElement(content);         },         /*         *  导出pdf函数         **/         exportReportPdf() {             window.open(this.newUrl)         }     }, }