前端html转pdf

转
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <button id="exportToPdf">导出为PDF</button>
<div id="export_content">
     <div>
         sdsf
         
     </div>
     <div style="color: red">
        sdsf
        1231313
    </div>
</div>
</body>
<script src="https://cdn.bootcss.com/jspdf/1.5.3/jspdf.debug.js"></script>
<script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.min.js"></script>
<script type="text/javascript">
    var downPdf = document.getElementById("exportToPdf");
    downPdf.onclick = function () {
        html2canvas(
                document.getElementById("export_content"),
                {
                    dpi: 172,//导出pdf清晰度
                    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 / 592.28 * 841.89;
                        //未生成pdf的html页面高度
                        var leftHeight = contentHeight;
                        //pdf页面偏移
                        var position = 0;
                        //html页面生成的canvas在pdf中图片的宽高（a4纸的尺寸[595.28,841.89]）
                        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', 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();
                                }
                            }
                        }
                        pdf.save('content.pdf');
                    },
                    //背景设为白色（默认为黑色）
                    background: "#fff"  
                })
    }
</script>
 
</html>
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