https://itunes.apple.com/cn/app/xxxx/idxxxxxxx?mt=8
mt = Media Type
1 Music
2 Podcasts
3 Audiobooks
4 TV Shows
5 Music Videos
6 Movies
7 iPod Games
8 Mobile Software Applications
9 Ringtones
10 iTunes U
11 E-Books
12 Desktop Apps
ls=1 means the URL will try and open iTunes and follow the link. If ls=1 is not included it will simply load the web page for that particular media asset
来源：http://stackoverflow.com/questions/1781427/what-is-mt-8-in-itunes-links-for-the-appstore