js生成pdf
const A4_WIDTH = 595.28
const A4_HEIGHT = 841.89
//参数 html(dom) imgsrc(封面可不加，直接加到第一个参数) fileName(文件名称)
export const handleHtml2pdf = (html, imgSrc, fileName, cb) => {
new html2canvas(html, {
useCORS: true,
allowTaint: true,
}).then(canvas => {
var contentWidth = canvas.width;
var contentHeight = canvas.height;
//一页pdf显示html页面生成的canvas高度;
var pageHeight = contentWidth / A4_WIDTH * A4_HEIGHT;
//未生成pdf的html页面高度
var leftHeight = contentHeight;
//页面偏移
var position = 0;
//a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
var imgWidth = A4_WIDTH;
var imgHeight = A4_WIDTH / contentWidth * contentHeight;
var pageData = canvas.toDataURL('image/jpeg', 1.0);
var pdf = new jsPDF('', 'pt', 'a4');
if (imgSrc) {
pdf.addImage(imgSrc, 'JPEG', 0, 0, imgWidth, imgHeight);
pdf.addPage();
}
if (leftHeight < pageHeight) {
pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
} else {
while (leftHeight > 0) {
//arg3-->距离左边距;arg4-->距离上边距;arg5-->宽度;arg6-->高度
pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
leftHeight -= pageHeight;
position -= A4_HEIGHT;
//避免添加空白页
if (leftHeight > 0) {
pdf.addPage();
}
}
}
pdf.save(fileName || "pdf.pdf");
cb()
})
}