函数错误：'[object BlobConstructor]'不是构造函数

Question

我有这个代码，使用jsPDF将html转换为pdfs。它在chrome和firefox中运行得很好，但是在safari中测试它时，我收到了这样的消息：error in function: '[object BlobConstructor]' is not a constructor。这是我的代码：

var doc = new jsPDF("p", "pt", "letter");
$(document).ready(function () 
{
$("#runpdf").click(function (event) 
{
    $(document.body).width(1903);
    var count=0;
    $("section").each(function()
    {
        $(this).children('footer').children('article').append($(document.createElement('span')).text((count+1)+".").css("float","right").css("font-weight", "900").css("font-size","150%"));
        count++;
    });    
    var pages = $(".page5");
    var remaining = pages.length;
    pages.each(function () 
    {        
        html2canvas($(this), 
        {
            logging: true,
            profile: true,
            allowTaint: true,
            letterRendering: true,
            onrendered: function (canvas) 
            {
                var imageData = canvas.toDataURL("image/jpeg");
                doc.addImage(imageData, 'JPEG', -425, 0, 1450, 800);
                remaining--;
                if (remaining === 0) 
                {
                    doc.save('test.pdf');
                }
                doc.addPage();
            }
        });

    });

});
});

有关如何修复此Safari问题的任何想法？提前致谢