pdfmake 介绍
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：
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line-wrapping,
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text-alignments (left, right, centered, justified),
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numbered and bulleted lists,
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tables and columns
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auto/fixed/star-sized widths,
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col-spans and row-spans,
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headers automatically repeated in case of a page-break,
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images and vector graphics,
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convenient styling and style inheritance,
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page headers and footers:
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static or dynamic content,
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access to current page number and page count,
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background-layer
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page dimensions and orientations,
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margins,
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custom page breaks,
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font embedding,
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support for complex, multi-level (nested) structures,
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helper methods for opening/printing/downloading the generated PDF.