答案在这里.

1. 应用请求 http://itunes.apple.com/lookup?bundleId=com.clickgamer.AngryBirds
2. 在 JSON 响应中找到 "version": "2.1.0" 和 "trackId": 343200656.

警告:此 API 未记录，Apple 可能会更改它，恕不另行通知.

Warning: This API is undocumented, Apple could change it without notice.

参考文献:

[1] https://github.com/nicklockwood/iVersion/blob/master/iVersion/iVersion.m#L705
[2] https://***.com/a/8841636/41948
[3] http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsLookup?id=343200656&mt=8
[4] http://itunes.apple.com/WebObjects/MZStoreServices.woa/ws/wsSearch?term=+Angry+Birds&country=US&media=software&entity=softwareDeveloper&limit=6&genreId=&version=2&output=json&callback=jsonp1343116626493