Cici

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Results 2 issues of Cici

IE11中微信二维码没有生成

![image](https://user-images.githubusercontent.com/32864732/84459702-acaa3b80-ac9a-11ea-9ea0-03cac79f52d6.png) 在谷歌中没问题，在ie11中有发现报错的

$.base64.encode(excelFile)

jquery.base64.js:136 Uncaught INVALID_CHARACTER_ERR: DOM Exception 5