导出滚动条外的表格，同时过滤不需要的元素。
1.安装插件
npm i html2canvas jspdf --save-dev2.新建htmlpdf.js文件
import html2Canvas from 'html2canvas';
import JsPDF from 'jspdf';
/**
* @param node 要生成 pdf 的DOM元素（容器）
* @param padfName PDF文件生成后的文件名字
* */
//主要代码
function downloadPDF(node, printHide, padfName) {
window.pageYoffset = 0;
document.documentElement.scrollTop = 0;
document.body.scrollTop = 0;
const el = document.querySelector(node); // 整个导出节点
return new Promise((resolve, reject) => {
const ele = document.querySelector(node);
let eleW = ele.offsetWidth; // 获得该容器的宽
let eleH = ele.offsetHeight; // 获得该容器的高
let eleOffsetTop = ele.offsetTop; // 获得该容器到文档顶部的距离
let eleOffsetLeft = ele.offsetLeft; // 获得该容器到文档最左的距离
var canvas = document.createElement("canvas");
let scaleBy = window.devicePixelRatio > 1 ? window.devicePixelRatio : 1;
canvas.width = eleW * 2; // 将画布宽&&高放大两倍
canvas.height = eleH * 2;
var context = canvas.getContext("2d");
context.scale(2, 2);
// context.translate(-offsetLeft - abs, -offsetTop);
var opts = {
// canvas: canvas,
// logging :true,
// dpi: 300,
// scale: window.devicePixelRatio * 2,
scale: 2, //解决pdf不清晰问题
width: eleW,
height: eleH,
useCORS: true,
background: "#FFF",
allowTaint: false,
dpi: window.devicePixelRatio * 2,
ignoreElements: (element) => {
if (element.id === printHide)
return true;
},
};
html2Canvas(el, opts).then((canvas) => {
var pdf = new JsPDF("p", "mm", "a4"); //A4纸，纵向
var ctx = canvas.getContext("2d"),
a4w = 200,
a4h = 287, //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) { //截取的高度小于html高度时
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",
5,
5,
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
try {
pdf.save(padfName + ".pdf");
window.open(pdf.output('bloburl'))
window.close();
resolve();
} catch (error) {
reject();
}
});
});
}
export default {
downloadPDF
}3.使用
html
<div class="table-wrap">
<el-table :table="table"
border
stripe>
</el-table>
</div>js
import htmlpdf from "@components/htmlpdf/htmlpdf";
toExportPdf() {
// 参数1要导出的节点;2.要过滤的节点（按钮）的id;3.文件名
htmlpdf.downloadPDF(".content-wrap", "printHide", "电厂交易结算清单");
}
