<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>测试PDF导出</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="js/html2canvas.min.js"></script>
<script src="js/jspdf.min.js"></script>
<style>
html,body { margin:0; padding:0; }
#page ul { padding:0;list-style:none; }
#page li { line-height:110px;color:#fff;padding-left:10px; }
.c0 { background-color:#ea644a; }
.c1 { background-color:#f1a325; }
.c2 { background-color:#38b03f; }
.c3 { background-color:#03b8cf; }
.c4 { background-color:#bd7b46; }
.c5 { background-color:#8666b8; }
</style>
<script>
function exportPdf() {
var element = document.getElementById("page");
html2canvas(element, {
logging:false
}).then(function(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;
}
pdf.save('content.pdf');
});
}
function generateData() {
var html = [];
html[html.length] = '';
for(var i = 0;i < 20;++i) {
html[html.length] = '- html[html.length] = i % 6;
html[html.length] = '">这是第';
html[html.length] = i;
html[html.length] = '行 ';
}
html[html.length] = '
';
document.getElementById('page').innerHTML = html.join('');
}
</script>
</head>
<body onload="generateData()">
<button onclick="exportPdf()">导出pdf</button>
<div id="page"></div>
</body>
</html>