HTML页面导出为PDF

1、需要的js文件

1. html2canvas.js
2. jsPdf.debug.js

其中html2canvas.js文件主要用于将html文件转换为图片，而jsPdf.debug.js文件负责将图片导成文件。

2、部分代码

function getPdf(idStr, title) {
  html2Canvas(document.querySelector('#' + idStr), {
    allowTaint: true
  }).then(canvas => {
    let contentWidth = canvas.width
    let contentHeight = canvas.height
    let pageHeight = contentWidth / 592.28 * 841.89
    let leftHeight = contentHeight
    let position = 0
    let imgWidth = 585.28
    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')
})