jsPDF + html2canvas 高清打印、A4分页截断 完美解决方案

详解链接：

    掘金： 
    - https://juejin.cn/post/7256306281538748477
    - https://juejin.cn/post/7138370283739545613

 解决以下问题
 1. 导出PDF模糊问题
 2. A4分页截断内容的问题
 3. 内容上下左右边距问题

Project setup

yarn install 

or

npm install 

Compiles and hot-reloads for development

yarn serve

or

npm run serve

Compiles and minifies for production

yarn build

Lints and fixes files

yarn lint

Customize configuration