问题：doc文档，ppt如何在线，在浏览器中浏览
解决：使用微软的链接
方法：
ppt在线浏览：
https://view.officeapps.live.com/op/view.aspx?src=http%3a%2f%2fvideo.ch9.ms%2fbuild%2f2011%2fslides%2fTOOL-532T_Sutter.pptx
doc在线浏览
https://view.officeapps.live.com/op/view.aspx?src=newteach.pbworks.com%2Ff%2Fele%2Bnewsletter.docx
xlsx
https://view.officeapps.live.com/op/view.aspx?src=http%3A%2F%2Flearn.bankofamerica.com%2Fcontent%2Fexcel%2FWedding_Budget_Planner_Spreadsheet.xlsx
参考：https://blogs.office.com/en-us/2013/04/10/office-web-viewer-view-office-documents-in-a-browser/