// 导出页面为PDF格式
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'
export default{
 install (Vue, options) {
 Vue.prototype.getPdf = function () {
  var title = this.htmlTitle
  html2Canvas(document.querySelector('#pdfDom'), {
  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')
  }
  )
 }
 }
}