var whiteImg = "data:image/jpeg;base64,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";
function ExportPdf(printId, pdfName) {
    $('body').append($(
        '<div id="pdfTip" class="pdfTip" style="width: 500px;height:50px;background:rgba(0,0,0,.5);color: red;position: fixed;top: 0;left: 0;right: 0;bottom: 0;margin: auto; z-index:9999;"><div style="text-align:center;line-height:50px;font-size:20px;font-weight:600;">正在生成PDF,请稍后...</div></div>'));
    html2canvas(document.querySelector("#" + printId),
        {
            allowTaint: true,
            scale: 1
        }).then((function (canvas) {
            //未生成pdf的html页面高度
            var leftHeight = canvas.height;
            var ph = 30;
            var a4Width = 595.28;
            var a4Height = 841.89 ;
            //一页pdf显示html页面生成的canvas高度;
            var a4HeightRef = Math.floor(canvas.width / a4Width * a4Height);
            //pdf页面偏移
            var position = 0;
            var pageData = canvas.toDataURL('image/jpeg', 1.0);
            var pdf = new jsPDF('x', 'pt', 'a4');
            var index = 1,
                canvas1 = document.createElement('canvas'),
                height;
            pdf.setDisplayMode('fullwidth', 'continuous', 'FullScreen');
            $('#pdfTip >div').html('正在生成第<span class="pdfProgress">1</span>页，共<span class="pdfTotal"></span>页...');
            function createImpl(canvas) {
                if (leftHeight > 0) {
                    index++;
                    var checkCount = 0;
                    if (leftHeight > a4HeightRef) {
                        for (var i = position + a4HeightRef; i >= position; i--) {
                            var isWrite = true;
                            for (var j = 0; j < canvas.width; j++) {
                                var c = canvas.getContext('2d').getImageData(j, i, 1, 1).data;
                                if (c[0] != 0xff || c[1] != 0xff || c[2] != 0xff) {
                                    isWrite = false;
                                    break;
                                }
                            }
                            if (isWrite) {
                                checkCount++;
                                if (checkCount >= 10) {
                                    break;
                                }
                            } else {
                                checkCount = 0;
                            }
                        }
                        height = Math.round(i - position) || Math.min(leftHeight, a4HeightRef);
                        if (height <= 0) {
                            height = a4HeightRef;
                        }
                    } else {
                        height = leftHeight;
                    }

                    canvas1.width = canvas.width;
                    canvas1.height = height;

                    // console.log(index, 'height:', height, 'pos', position);

                    var ctx = canvas1.getContext('2d');
                    ctx.drawImage(canvas, 0, position, canvas.width, height, 0, 0, canvas.width, height);

                    //var pageHeight = Math.round(a4Width / canvas.width * height);
                    // pdf.setPageSize(null, pageHeight)
                    if (position != 0) {
                        pdf.addPage();
                    }
                    //pdf.addImage(whiteImg, "jpeg", 0, 0, a4Width, ph);
                    var h = a4Width / canvas1.width * height;
                    pdf.addImage(canvas1.toDataURL('image/jpeg', 1.0),'JPEG',0,0,a4Width,h);
                    //pdf.addImage(whiteImg, "jpeg", 0, 0, a4Width, h + ph);
                    leftHeight -= height;
                    position += height;
                    $('#pdfTip .pdfProgress').text(index + 1);
                    $('#pdfTip .pdfTotal').text(index + Math.ceil(leftHeight / a4HeightRef));
                    if (leftHeight > 0) {
                        setTimeout(createImpl, 500, canvas);
                    } else {
                        pdf.save(pdfName + '.pdf');
                        $('#pdfTip').remove();
                    }
                }
            }

            //当内容未超过pdf一页显示的范围，无需分页
            if (leftHeight < a4HeightRef) {
                pdf.addImage(pageData, 'JPEG', 0, 0, a4Width, a4Width / canvas.width * leftHeight);
                pdf.save(pdfName + '.pdf');
            } else {
                try {
                    pdf.deletePage(0);
                    $('.pdfTip').show();
                    $('.pdfTotal').text(index + Math.ceil(leftHeight / a4HeightRef));
                    setTimeout(createImpl, 500, canvas);
                } catch (err) {
                    console.log(err);
                }
            }
        }));
}
//function ExportPdf(printId,name) {
//    html2canvas(document.querySelector("#" + printId),
//        {
//            allowTaint: !0,
//            scale: 2
//        }).then((function(canvas) {
//        var contentWidth = canvas.width,
//            contentHeight = canvas.height,
//            pageData = canvas.toDataURL("image/jpeg", 1),
//            pdfX,
//            pdfY = contentHeight / 2 * .75,
//            whiteHeight = 60,
//            pdfW = 595.32,
//            pdfH = 841.89,
//            imgX = contentWidth / 2 * .75,
//            imgY = contentHeight / 2 * .75,
//            imgH = 721.89,
//            position = 60,
//            pageTempHeight = contentHeight / 2 * .75,
//            PDF = new jsPDF("", "pt", "a4");
//        if (imgY < imgH)
//            PDF.addImage(whiteImg, "jpeg", 0, 0, pdfW, 60),
//                PDF.addImage(pageData, "jpeg", 0, 0, imgX, imgH),
//                PDF.addImage(whiteImg, "jpeg", 0, 781.89, pdfW, 60);
//        else
//            for (; pageTempHeight > 0;)
//                PDF.addImage(pageData, "jpeg", 0, position, imgX, imgY),
//                    PDF.addImage(whiteImg, "jpeg", 0, 0, pdfW, 60),
//                    PDF.addImage(whiteImg, "jpeg", 0, 782.89, pdfW, 60),
//                    position -= imgH,
//                    (pageTempHeight -= imgH) > 0 && PDF.addPage();
//        PDF.save(name + ".pdf");
//    }));
//}