直接上代码 (直接复制即可 )
1.准备一个文件用来封装功能
下面展示里面的代码
// 页面导出为pdf格式
import html2Canvas from 'html2canvas';
import jsPDF from 'jspdf';
const htmlToPdf = {
getPdf (title, id) {
console.log(id);
// loading = true;
// console.log(loading);
console.log(document.querySelector(id));
html2Canvas(document.querySelector(id), {
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
let ctx = canvas.getContext('2d'),
a4w = 190,
a4h = 227, //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) {
const page = document.createElement('canvas');
console.log(page);
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;
3. 直接调用即可
1.导入
2.调用方法加入对应的参数
效果展示