html2canvas 获取不到节点的内容

我的界面内容篇幅比较长,再用html2canvasjs截取界面内容时,只能截取到
界面中显示的节点内容,不显示的节点内容截取不到

<div class="text-center" style="margin-top: 20px;margin-bottom: 20px;" id="but">
                        <button class="btn btn-warning" id="renderPdf">打印保险理赔申请表</button>
                    </div>
 var downPdf = document.getElementById("renderPdf");

      downPdf.onclick = function() {
          html2canvas(document.getElementById("but"), {
              allowTaint: false,
              taintTest: false,
              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;
                  //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 = 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');
              }
          });

上面这段代码节点可以截取到
图片说明

<div class="panel-heading" id="tencent">
                    <h2 class="text-center">
                        腾讯商业保险医疗险理赔申请表<br>
                        <span>(员工和家属请分开填写)</span>
                    </h2>
                </div>
                var downPdf = document.getElementById("renderPdf");

      downPdf.onclick = function() {
          html2canvas(document.getElementById("tencent"), {
              allowTaint: false,
              taintTest: false,
              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;
                  //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 = 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');
              }
          });

这个节点就获取不到
图片说明

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- rn 手机QQ rn http://imga1.4399.com/upload_pic/2011/1/21/4399_14070861413.jpg rn com.tencent.qq rn 1.0.0 rn 地方反反复复反反复复方法 rn- rn- rn 获取不到。。。。rn rn rn 4006915 rn 2011.01.01 00:00:00 rn rnrn我用l.getElementsByTagName(“节点名字”).item(0).getFirstChild().getNodeValue();获取节点里面的值 其他节点都能得到,为什么就downurl节点的值取不到,帮忙回答下 谢谢
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相关代码如下:rn[code=html] rn rn rn rn rn rn <%rn String htmlData=(String)request.getAttribute("desc")!= null ? (String)request.getAttribute("desc"): "";rn%> rn 详细内容rn rn <%=htmlspecialchars(htmlData)%>rn rnrn rn rn 提交rn rn rn [/code]rn比如我要把网页里某一篇HTML文章粘贴过来,rn提交后,数据库获取值为空,怎么解决?谢谢!!
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