Vue3实现将页面转成PDF并下载或直接打印
// 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;