<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.js"></script>
<script src="https://cdn.bootcss.com/jspdf/1.3.4/jspdf.debug.js"></script>
</head>
<body>
<div>
jspdf 的使用
</div>
<div class="right-aside">
JSPDF的使用
</div>
<script>
fn()
function fn() {
var target = document.getElementsByClassName("right-aside")[0];
target.style.background = "#FFFFFF";
html2canvas(target, {
onrendered:function(canvas) {
console.log(12)
var contentWidth = canvas.width;
var contentHeight = canvas.height;
//一頁pdf顯示html頁面生成的canvas高度;
var pageHeight = contentWidth / 592.28 * 841.89;
//未生成pdf的html頁面高度
var leftHeight = contentHeight;
//頁面偏移
var position = 0;
//a4紙的尺寸[595.28,841.89]，html頁面生成的canvas在pdf中圖片的寬高
var imgWidth = 595.28;
var imgHeight = 592.28/contentWidth * contentHeight;
var pageData = canvas.toDataURL('image/jpeg', 1.0);
var pdf = new jsPDF('', 'pt', 'a4');
//有兩個高度需要區分，一個是html頁面的實際高度，和生成pdf的頁面高度(841.89)
//當內容未超過pdf一頁顯示的范圍，無需分頁
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;
//避免添加空白頁
if(leftHeight > 0) {
pdf.addPage();
}
}
}
pdf.save("content.pdf");
// 轉base64
var datauri = pdf.output('dataurlstring')
var base64 = datauri.substring(28);
console.log(base64)
}
})
}
</script>
</body>
</html>
