html：
<a href="http://view.officeapps.live.com/op/view.aspx?src=http%3a%2f%2fvideo.ch9.ms%2fbuild%2f2011%2fslides%2fTOOL-532T_Sutter.pptx"></a>
# http://view.officeapps.live.com/op/view.aspx?src=加上文件的url
js跳转:
window.open('http://view.officeapps.live.com/op/view.aspx?src=http%3a%2f%2fvideo.ch9.ms%2fbuild%2f2011%2fslides%2fTOOL-532T_Sutter.pptx')
# 类似的http://view.officeapps.live.com/op/view.aspx?src=加上文件的url