安装依赖
cnpm i html2canvas jspdf
引入
import html2canvas from 'html2canvas';
import jspdf from 'jspdf';
async downReport() {
const doc = document.getElementById('scan-report');
// console.log(doc);
this.$nextTick(() => {
html2canvas(doc, {
allowTaint: false, // 允许污染
taintTest: true, // 在渲染前测试图片(没整明白有啥用)
useCORS: 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 / 592.28 * 841.89;
// 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 = 595.28;
var imgHeight = 592.28 / contentWidth * contentHeight;
var pageData = canvas.toDataURL('image/jpeg', 1.0);
// eslint-disable-next-line new-cap
var pdf = new jspdf('', 'pt', 'a4');
// 有两个高度需区分,一个是html页面的实际高度,和生成pdf的页面高度(841.89)
// 当内容未超过pdf一页显示的范围,无需分页
if (leftHeight < pageHeight) {
pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
} else {
while (leftHeight > 0) {
pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
leftHeight -= pageHeight;
position -= 841.89;
// 避免添加空白页
if (leftHeight > 0) {
pdf.addPage();
}
}
}
var name = '小程序风险扫描报告.pdf'; // 定义生成的pdf的文件名字
pdf.save(name);
});
});
},
注意坑
-
html2canvas 不支持将iframe内容打印出pdf
-
html2canvas 不支持打印svg图片