在使用JavaScript使用jspdf库的同时关闭后获取空白页

Question

我正在尝试使用JsPdf以PDF格式打印HTML内容，但是无法正常工作；所有内容都不会到来。我在下面提供我的代码。

$(document).ready(function(){
      $("#print").click(function(){
           var pdf = new jsPDF('p', 'pt', 'letter');
    pdf.canvas.height = 72 * 11;
    pdf.canvas.width = 72 * 8.5;
    // source can be HTML-formatted string, or a reference
    // to an actual DOM element from which the text will be scraped.
    source = $('#pcntr')[0];
    //console.log('source',source);
    // we support special element handlers. Register them with jQuery-style 
    // ID selector for either ID or node name. ("#iAmID", "div", "span" etc.)
    // There is no support for any other type of selectors 
    // (class, of compound) at this time.
    specialElementHandlers = {
        // element with id of "bypass" - jQuery style selector
        '#bypassme': function (element, renderer) {
            // true = "handled elsewhere, bypass text extraction"
            return true
        }
    };
    margins = {
        top: 20,
        bottom: 20,
        left: 10,
        width: 300
    };
    // all coords and widths are in jsPDF instance's declared units
    // 'inches' in this case
    pdf.fromHTML(
    source, // HTML string or DOM elem ref.
    margins.left, // x coord
    margins.top, { // y coord
        'width': margins.width, // max width of content on PDF
        'elementHandlers': specialElementHandlers
    },

    function (dispose) {
        console.log('hello');
        // dispose: object with X, Y of the last line add to the PDF 
        //          this allow the insertion of new lines after html
        pdf.save('Test.pdf');
    }, margins);
      });
  });

在这里，我只是想将我所有的HTML内容（包括CSS和图像部分）转换为PDF，但是一些文本即将到来，而有些则没有。许多空白页也将到来。 Here is my complete plunkr code。我需要创建全部内容的PDF文件。