vue+html2canvas 生成pdf报错

Question

最近在使用html2canvas 生成pdf时，其中背景图是根据后台返回路径而动态生成的，
背景图片无法显示，而图片地址在浏览器中是可以打开显示出来的！
报错信息

js代码

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

export default {
 install(Vue, options) {
   Vue.prototype.$getPdf = function (id, title) {
     function getScrollWidth() {
       var noScroll, scroll
       var oDiv = document.createElement('DIV')
       oDiv.style.cssText = 'position:absolute; top:-1000px; width:100px; height:100px; overflow:hidden;'
       noScroll = document.body.appendChild(oDiv).clientWidth
       oDiv.style.overflowY = 'scroll'
       scroll = oDiv.clientWidth
       document.body.removeChild(oDiv)
       return noScroll - scroll
     }

     const SIZE = [595.28, 841.89] // a4宽高
     let node = document.querySelector(`#${id}`)
     let nodeW
     if (getScrollWidth()) {
       nodeW = node.clientWidth - (17 - getScrollWidth())
     } else {
       nodeW = node.clientWidth
     }
     // let nodeW = node.clientWidth
     // 单页高度
     let pageH = nodeW / SIZE[0] * SIZE[1]
     let modules = node.children
     for (let i = 0, len = modules.length; i < len; i++) {
       let item = modules[i]
       let beforeH = item.offsetTop
       let afterH = beforeH + item.clientHeight
       let currentPage = parseInt(beforeH / pageH)
       if (currentPage !== parseInt(afterH / pageH)) {
         let lastItemAftarH = modules[i - 1].offsetTop + modules[i - 1].clientHeight
         let fill = pageH - lastItemAftarH % pageH
         item.style.marginTop = fill + 'px'
       }
     }
     html2Canvas(node, {
       // allowTaint: true,
       useCORS: true,//跨域设置
       scale: 2,
     }).then(function (canvas) {
       let contentWidth = canvas.width
       let contentHeight = canvas.height
       let pageHeight = contentWidth / SIZE[0] * SIZE[1]
       let leftHeight = contentHeight
       let position = 0
       // 横向页边距
       let sidesway = 0
       // html页面生成的canvas在pdf中图片的宽高
       let imgWidth = SIZE[0] - sidesway * 2
       let imgHeight = imgWidth / contentWidth * contentHeight
       let pageData = canvas.toDataURL('image/jpeg', 1.0)
       let PDF = new JsPDF('', 'pt', 'a4')
       if (leftHeight < pageHeight) {
         PDF.addImage(pageData, 'JPEG', sidesway, position, imgWidth, imgHeight)
       } else {
         while (leftHeight > 0) {
           PDF.addImage(pageData, 'JPEG', sidesway, position, imgWidth, imgHeight)
           leftHeight -= pageHeight
           position -= SIZE[1]
           if (leftHeight > 0) {
             PDF.addPage()
           }
         }
       }
       PDF.save(title + '.pdf')
     })
   }
 }
}

各位大神 ，请问有什么解决办法！

Answer 1

应该是canvas使用图片跨域了，通常需要后端解决