vue2.0将页面html导出为pdf格式文档

1. npm i html2canvas
2. npm i jspdf
3. 创建一个js文件

// 页面导出为pdf格式 //title表示为下载的标题，html表示document.querySelector('#myPrintHtml')
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

const htmlPdf = {
 getPdf(title, html) {
   html2Canvas(html, {
     allowTaint: false,
     taintTest: false,
     logging: false,
     useCORS: true,
     dpi: window.devicePixelRatio * 4, // 将分辨率提高到特定的DPI 提高四倍
     scale: 4, // 按比例增加分辨率
   }).then((canvas) => {
     const pdf = new JsPDF('p', 'mm', 'a4') // A4纸，纵向
     const ctx = canvas.getContext('2d')
     const a4w = 190
     const a4h = 200 // A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277
     const imgHeight = Math.floor((a4h * canvas.width) / a4w) // 按A4显示比例换算一页图像的像素高度
     let renderedHeight = 0
     while (renderedHeight < canvas.height) {
       const page = document.createElement('canvas')
       page.width = canvas.width
       page.height = Math.min(imgHeight, canvas.height - renderedHeight)

       // 用getImageData剪裁指定区域，并画到前面创建的canvas对象中
       page
         .getContext('2d')
         .putImageData(
           ctx.getImageData(
             0,
             renderedHeight,
             canvas.width,
             Math.min(imgHeight, canvas.height - renderedHeight)
           ),
           0,
           0
         )
       pdf.addImage(
         page.toDataURL('image/jpeg', 1.0),
         'JPEG',
         10,
         10,
         a4w,
         Math.min(a4h, (a4w * page.height) / page.width)
       ) // 添加图像到页面，保留10mm边距

       renderedHeight += imgHeight
       if (renderedHeight < canvas.height) {
         pdf.addPage() // 如果后面还有内容，添加一个空页
       }
       // delete page;
     }
     // 保存文件
     pdf.save(`${title}.pdf`)
   })
 },
}

export default htmlPdf

页面在调用这个方法就可以了

<template>
 <div class="main">
   <div>1af4sa4fadiv>
   <div>dsasafsa4fsdiv>
   <van-image width="100" height="100" src="https://img01.yzcdn.cn/vant/cat.jpeg" />
 div>
 template>
 
<script>
import htmlPdf from '@/utils/htmlPdf'

export default {
 methods: {
   handelFun() {
     htmlPdf.getPdf('导出pdf', document.querySelector('.main'))
   },
 },
}
script>

不走下载，转为base64传给后端

/* eslint-disable no-param-reassign */
// 页面导出为pdf格式 //title表示为下载的标题，html表示document.querySelector('#myPrintHtml')
// 参考地址 http://html2canvas.hertzen.com/configuration
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

const htmlPdf = {
  getPdf(title, html) {
    return new Promise((resolve) => {
      html2Canvas(html, {
        allowTaint: false,
        taintTest: false,
        logging: false,
        useCORS: true,
        windowWidth: '1000px',
        dpi: window.devicePixelRatio * 3, // 将分辨率提高到特定的DPI 提高四倍
        scale: 2, // 按比例增加分辨率
      }).then((canvas) => {
        console.log(canvas)
        const pdf = new JsPDF('p', 'mm', 'a4') // A4纸，纵向
        const ctx = canvas.getContext('2d')
        console.log(ctx, 'ctx')
        const a4w = 190
        const a4h = 286 // A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277
        const imgHeight = Math.floor((a4h * canvas.width) / a4w) // 按A4显示比例换算一页图像的像素高度
        let renderedHeight = 0
        while (renderedHeight < canvas.height) {
          const page = document.createElement('canvas')
          page.width = canvas.width
          page.height = Math.min(imgHeight, canvas.height - renderedHeight)

          // 用getImageData剪裁指定区域，并画到前面创建的canvas对象中
          page
            .getContext('2d')
            .putImageData(
              ctx.getImageData(
                0,
                renderedHeight,
                canvas.width,
                Math.min(imgHeight, canvas.height - renderedHeight)
              ),
              0,
              0
            )
          pdf.addImage(
            page.toDataURL('image/jpeg', 1.0),
            'JPEG',
            10,
            10,
            a4w,
            Math.min(a4h, (a4w * page.height) / page.width)
          ) // 添加图像到页面，保留10mm边距

          renderedHeight += imgHeight
          if (renderedHeight < canvas.height) {
            pdf.addPage() // 如果后面还有内容，添加一个空页
          }
          // delete page;
        }
        // 保存文件
        // pdf.save(`${title}.pdf`)

        // 获取 base64
        const pdfData = pdf.output('datauristring')
        resolve(pdfData)
      })
    })
  },
}

export default htmlPdf

<template>
 <div class="main">
   <div>1af4sa4fadiv>
   <div>dsasafsa4fsdiv>
   <van-image width="100" height="100" src="https://img01.yzcdn.cn/vant/cat.jpeg" />
 div>
 template>
 
<script>
import htmlPdf from '@/utils/htmlPdf'

export default {
 methods: {
   handelFun() {
    htmlPdf.getPdf('导出pdf', document.querySelector('.main')).then((res) => {
        console.log('base64', res)
      })
   },
 },
}
script>

一个标签代表一个pdf页面，for循环

    handelFun() {
      const arr = [
        document.querySelector('.qwe'),
        document.querySelector('.qwer'),
        document.querySelector('.qwert'),
      ]
      // 自定义加载图标
      this.$toast.loading({
        message: '加载中...',
        forbidClick: true,
        loadingType: 'spinner',
      })
      htmlPdf
        .getPdf('导出pdf', arr)
        .then((res) => {
          const str = base64toFilePdf(res, '委托书')
          this.arr.push(str)
          // console.log(str)
        })
        .then(() => {
          const formDatas = new FormData()
          formDatas.append('file', this.arr[0])
          formDatas.append('needInfo', 1)
          formDatas.append('fileName', this.arr[0].name.split('.')[0])
          formDatas.append('fileType', this.arr[0].name.split('.')[1])
          formDatas.append('bucketName', 'content_bucket')
          formDatas.append('token', 'a::A09AA21B1A2F42F7B2C3581339B0563C')
          myUploadFile(formDatas)
            // eslint-disable-next-line no-shadow
            .then((ress) => {
              const data = JSON.parse(ress.data.data).url
              this.upload(data)
              console.log(data)
            })
            .catch((error) => {
              this.$toast(error)
            })
        })
    },

js文件

/* eslint-disable no-param-reassign */
// 页面导出为pdf格式 //title表示为下载的标题，html表示document.querySelector('#myPrintHtml')
// 参考地址 http://html2canvas.hertzen.com/configuration
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

const htmlPdf = {
  getPdf(title, html) {
    // eslint-disable-next-line no-async-promise-executor
    return new Promise(async (resolve) => {
      const pdf = new JsPDF('p', 'mm', 'a4') // A4纸，纵向
      for (let i = 0; i < html.length; i++) {
        const canvas = await html2Canvas(html[i], {
          allowTaint: false,
          taintTest: false,
          logging: false,
          useCORS: true,
          windowWidth: '1000px',
          dpi: window.devicePixelRatio * 3, // 将分辨率提高到特定的DPI 提高四倍
          scale: 2, // 按比例增加分辨率
        })

        const ctx = canvas.getContext('2d')
        const a4w = 190
        const a4h = 286 // A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277
        const imgHeight = Math.floor((a4h * canvas.width) / a4w) // 按A4显示比例换算一页图像的像素高度
        let renderedHeight = 0
        while (renderedHeight < canvas.height) {
          const page = document.createElement('canvas')
          page.width = canvas.width
          page.height = Math.min(imgHeight, canvas.height - renderedHeight)

          // 用getImageData剪裁指定区域，并画到前面创建的canvas对象中
          page
            .getContext('2d')
            .putImageData(
              ctx.getImageData(
                0,
                renderedHeight,
                canvas.width,
                Math.min(imgHeight, canvas.height - renderedHeight)
              ),
              0,
              0
            )
          pdf.addImage(
            page.toDataURL('image/jpeg', 1.0),
            'JPEG',
            10,
            10,
            a4w,
            Math.min(a4h, (a4w * page.height) / page.width)
          ) // 添加图像到页面，保留10mm边距

          renderedHeight += imgHeight
          // if (renderedHeight < canvas.height) {
          //   pdf.addPage() // 如果后面还有内容，添加一个空页
          // }
          // delete page;
        }
        // 保存文件
        if (i + 1 === html.length) {
          console.log(title)
          // pdf.save(`${title}.pdf`)
          const pdfData = pdf.output('datauristring')
          resolve(pdfData)
        } else {
          pdf.addPage()
        }
        // 获取 base64
        // const pdfData = pdf.output('datauristring')
        // resolve(pdfData)
      }
    })
  },
}

export default htmlPdf