vue中html如何转成pdf下载，pdf转base64,忽略某个元素渲染在pdf中，方法封装

一、下载 html2Canvas jspdf

npm install jspdf   html2canvas

二、封装转换下载方法 htmlToPdf.js

import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'/*** @param {*} reportName 下载时候的标题* @param {*} isDownload  是否下载默认为下载，传false不下载*/
export default function (dom, reportName = '文件', isDownload = false) {if (!dom) {return}// document.getElementById('hideDom').style.display='none'//  var target = document.getElementsByClassName("right-aside")[0];// target.style.background = "#FFFFFF";return new Promise((resolve, reject) => {html2Canvas(dom, {allowTaint: true,dpi: window.devicePixelRatio * 2,useCORS: true,}).then((canvas) => {console.log('canvas: ', canvas);let contentWidth = canvas.widthlet contentHeight = canvas.height//一页pdf显示html页面生成的canvas高度;let pageHeight = contentWidth / 592.28 * 841.89//未生成pdf的html页面高度let leftHeight = contentHeight//页面偏移let position = 0//a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高let imgWidth = 595.28let imgHeight = 592.28 / contentWidth * contentHeightlet pageData = canvas.toDataURL('image/jpeg', 1.0)let PDF = new JsPDF('', 'pt', 'a4', true)//有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面高度(841.89)//当内容未超过pdf一页显示的范围，无需分页if (leftHeight < pageHeight) {PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight, undefined, 'FAST')} else {while (leftHeight > 0) {PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight, undefined, 'FAST')leftHeight -= pageHeightposition -= 841.89//避免添加空白页if (leftHeight > 0) {PDF.addPage()}}}if (isDownload) {PDF.save(reportName + '.pdf')}/*** output可选参数* arraybuffer* blob* bloburi* datauristring* datauri* dataurlnewwindow* pdfobjectnewwindow* pdfjsnewwindow*/// const pdfBlob = pdf.output('blob')//别的方法：pdf.output("dataurlstring").split("base64,")[1]是base64，//实际上pdf.output("dataurlstring")就是base64//const dataurl = `data:application/pdf;base64,${PDF.output('dataurlstring').split('base64,')[1]}`var pdfData = PDF.output('datauristring')//获取base64Pdfresolve(pdfData)}).catch(err => {console.log('err: ', err);reject(err)})})
}

三、vue页面使用

  <button @click="onGeneratePDF">生成 PDF</button><div : id="htmlToPdfDom"><div>内容内容内容</div><div>内容内容内容</div><div :data-html2canvas-ignore="true">我是页面显示的元素，pdf不显示的元素，标签增加一个:data-html2canvas-ignore="true"属性即可</div></div>//引入封装的js方法
import htmlToPdf  from './htmlToPdf.js'//按钮点击的方法
onGeneratePDF () {this.$nextTick(() => {htmlToPdf(document.getElementById('htmlToPdfDom'),'自定义下载pdf的文件名',true).then(res=>{console.log('我是pdf转的base64',res)console.log('需要传给后端base64可以在此请求接口')})})}

四、html2canvas直通车

html2canvas中文文档链接：https://www.html2canvas.cn/html2canvas-configuration.html