版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/qq_21901233/article/details/88227027
1. 引入三个js文件
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.js"></script>
<script src="https://cdn.bootcss.com/jspdf/1.5.3/jspdf.debug.js"></script>
2. 将整个html文档渲染成一个canvas image,并且通过jsPdf把图片导出为pdf文件
function loadPdf() {
html2canvas(document.body, {
onrendered:function(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 / 595.28 * 841.89;
//未生成pdf的html页面高度
var leftHeight = contentHeight;
//pdf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 = 555.28;
var imgHeight = 555.28/contentWidth * contentHeight;
var pageData = canvas.toDataURL('image/jpeg', 1.0);
var pdf = new jsPDF('', 'pt', 'a4');
//有两个高度需要区分,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', 20, 0, imgWidth, imgHeight );
} else {
while(leftHeight > 0) {
pdf.addImage(pageData, 'JPEG', 20, position, imgWidth, imgHeight)
leftHeight -= pageHeight;
position -= 841.89;
//避免添加空白页
if(leftHeight > 0) {
pdf.addPage();
}
}
}
// 将pdf输入为base格式的字符串
var buffer = pdf.output("datauristring")
// 将base64格式的字符串转换为file文件
var myfile = dataURLtoFile(buffer, pdfName)
var formdata = new FormData()
formdata.append(name, myfile)
// 之后ajax传递数据
}
})
}
//将base64转换为文件对象
function dataURLtoFile(dataurl, filename) {
var arr = dataurl.split(',');
var mime = arr[0].match(/:(.*?);/)[1];
var bstr = atob(arr[1]);
var n = bstr.length;
var u8arr = new Uint8Array(n);
while(n--){
u8arr[n] = bstr.charCodeAt(n);
}
//转换成file对象
return new File([u8arr], filename, {type:mime});
//转换成成blob对象
//return new Blob([u8arr],{type:mime});
}