html2canvas 实现单页面转pdf下载

工具类

// 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')
}
)
}
}
}

main.js

import Vue from 'vue'
import 'normalize.css/normalize.css' // A modern alternative to CSS resets
import ElementUI from 'element-ui'import 'element-ui/lib/theme-chalk/index.css'import locale from 'element-ui/lib/locale/lang/en' // lang i18n
import '@/styles/index.scss' // global css
import App from './App'import router from './router'import store from './store'import { post, fetch, jsonPost } from './utils/request'// 导入ajaximport htmlToPdf from './utils/htmlToPdf'// 使用Vue.use()方法就会调用工具方法中的install方法Vue.use(htmlToPdf)import '@/icons' // iconimport '@/permission' // permission control// 定义全局变量Vue.prototype.$post = postVue.prototype.$fetch = fetchVue.prototype.$jsonPost = jsonPostVue.use(ElementUI, { locale })
Vue.config.productionTip = false
new Vue({  el: '#app',  router,  store,  render: h => h(App)})

业务DOM

<el-button @click="getPdf('#pdfDom')">点击下载
 <div id="pdfDom">
   //需要打印的元素
  </div>