html导出pdf（vue中可用）

html导出pdf（vue中可用）

1、插件安装

npm install html2canvas --save 

npm install jspdf --save
<script src="https://cdn.bootcss.com/jspdf/1.3.4/jspdf.debug.js"></script>

2、注册一个全局可用的导出方法

// 导出页面为PDF格式
import html2canvas from 'html2canvas'
export default {
  install(Vue, options) {
    Vue.prototype.ExportSavePdf = function(htmlTitle, currentTime) {
      var element = document.getElementById('pdfCentent')
      html2canvas(element, {
        logging: false
      }).then(function(canvas) {
        var pdf = new jsPDF('p', 'mm', 'a4') // A4纸，纵向
        var ctx = canvas.getContext('2d')
        var a4w = 170
        var a4h = 280 // A4大小，210mm x 297mm，四边各保留20mm的边距，显示区域170x257
        var imgHeight = Math.floor(a4h * canvas.width / a4w) // 按A4显示比例换算一页图像的像素高度
        var renderedHeight = 0

        while (renderedHeight < canvas.height) {
          var page = document.createElement('canvas')
          page.width = canvas.width
          page.height = Math.min(imgHeight, canvas.height - renderedHeight)// 可能内容不足一页

          // 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;
        }
        pdf.save(htmlTitle + currentTime)
      })
    }
  }
}

3、组件内要导出PDF

<div id="pdfCentent">
    我是导出pdf里面的内容
    <div @click="ExportSavePdf(htmlTitle,nowTime)">导出导出div>
 div>

4、ie浏览器目前不支持下载，原因是不支持一些方法，感兴趣的可看下这篇文章

https://blog.csdn.net/hongyu_789/article/details/80494156

https://www.iteye.com/topic/376590

5.在vue的组件里面做了一个小demo：

<template>
  <div class="three">
   <div id="pdfCentent">
    我是导出pdf里面的内容
    <el-button @click="ExportSavePdf(htmlTitle,nowTime)" type="primary">导出</el-button>
 </div>
  </div>
</template>

<script>
import html2canvas from 'html2canvas'
import jsPDF from 'jspdf'
export default {
  components: {},
  data() {
    return {
     
    };
  },
 
  methods:{
    ExportSavePdf(htmlTitle, currentTime){
      var element = document.getElementById('pdfCentent')
      html2canvas(element, {
        logging: false
      }).then(function(canvas) {
        var pdf = new jsPDF('p', 'mm', 'a4') // A4纸，纵向
        var ctx = canvas.getContext('2d')
        var a4w = 170
        var a4h = 280 // A4大小，210mm x 297mm，四边各保留20mm的边距，显示区域170x257
        var imgHeight = Math.floor(a4h * canvas.width / a4w) // 按A4显示比例换算一页图像的像素高度
        var renderedHeight = 0

        while (renderedHeight < canvas.height) {
          var page = document.createElement('canvas')
          page.width = canvas.width
          page.height = Math.min(imgHeight, canvas.height - renderedHeight)// 可能内容不足一页

          // 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;
        }
        pdf.save(htmlTitle + currentTime)
      })
    }
  }
};
</script>
<style lang="less">
.three{
  padding: 30px;
  width:100%;
  height: 100%;
  
}
</style>

效果：