Vue3实现将页面转成PDF并下载或直接打印

步骤一：安装依赖包

npm i html2canvas
npm i jspdf

步骤二：在utils文件夹下新建htmlToPdf.js文件

// 页面导出为pdf格式
import html2Canvas from 'html2canvas';
import jsPDF from 'jspdf';

const htmlToPdf = {
  getPdf(title, loading) {
    // loading = true;
    console.log(loading);
    html2Canvas(document.querySelector('#pdfDom'), {
      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) => {
      var pdf = new jsPDF('p', 'mm', 'a4'); //A4纸，纵向
      var ctx = canvas.getContext('2d'),
        a4w = 190,
        a4h = 272, //A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277
        imgHeight = Math.floor((a4h * canvas.width) / a4w), //按A4显示比例换算一页图像的像素高度
        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;
      }
      //保存文件
      pdf.save(title + '.pdf');
      // loading = false;
      console.log(loading);
    });
  },
};

export default htmlToPdf;

步骤三：来到需要将vue转成pdf的页面

...

<el-button size="mini" type="primary" @click="pdfFunc" :loading="loading">
  转成pdf
el-button>
...
<div id="pdfDom">
	
div>
<script setup>
// 导入htmlToPdf.js
import htmlToPdf from '../utils/htmlToPdf';
const pdfFunc = () => {
	 loading.value = true;
	 // 调用htmlToPdf工具函数
     htmlToPdf.getPdf('文档名称');
     // 定时器模拟按钮loading动画的时间
      setTimeout(() => {
        loading.value = false;
        ElMessage.success('打印成功!');
      }, 1000);
}
script>