Angular 6 JsPDF不会直接从HTML导出（波斯字符和CSS）

Question

使用此功能的JsPDF会从中导出PDF，但CSS会被忽略，波斯字符会显示like the image attached.

createPdf() {
    let doc = new jsPDF();
    let specialElementHandlers = {
      '#editor': function (element, renderer) {
        return true
      }
    };
    let inquiryResult = this.inquiryResult.nativeElement;
    doc.fromHTML(inquiryResult.innerHTML, 15, 15, {
       'width': 190,
       'elementHandlers': specialElementHandlers
        }, function() {
           doc.save('result.pdf');
        });
 }