pdfmake 是基于客户端服务器的 PDF 打印解决方案，完全基于 JavaScript 开发。提供强大的排版引擎
安装：
client-version bower install pdfmake server-version npm install pdfmake
特性：
line-wrapping,
text-alignments (left, right, centered, justified),
numbered and bulleted lists,
tables and columns
auto/fixed/star-sized widths,
col-spans and row-spans,
headers automatically repeated in case of a page-break,
images and vector graphics,
convenient styling and style inheritance,
page headers and footers:
static or dynamic content,
access to current page number and page count,
background-layer
page dimensions and orientations,
margins,
custom page breaks,
font embedding,
support for complex, multi-level (nested) structures,
helper methods for opening/printing/downloading the generated PDF.
