excel导出： mac safari对application/x-msdownload的支持不佳

https://blog.****.net/lizeyang/article/details/8982155?locationNum=3&fps=1

http://tool.oschina.net/commons

解决： http://ju.outofmemory.cn/entry/133400　　　　https://blog.robotshell.org/2012/deal-with-http-header-encoding-for-file-download/