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// 页面导出为pdf格式
import html2Canvas from 'html2canvas'
import jsPDF from 'jspdf'
const htmlToPdf = {
getPdf(title,url) {
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 = 277, //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')
})
}
};
export default htmlToPdf;