Windows Phone API Reference
http://msdn.microsoft.com/zh-cn/library/windows/apps/ff626516 (v=vs.105). aspx
What's new in Windows Phone 8.1
Http://msdn.microsoft.com/library/windows/apps/dn632424.aspx
QuickStart: Recording a screen with Screencapture (XAML)
Http://msdn.microsoft.com/zh-cn/library/windows/apps/xaml/dn642093.aspx
Working with the Back button (XAML) in a Windows Phone app
Http://msdn.microsoft.com/zh-cn/library/windows/apps/xaml/dn639128.aspx
Detecting geolocation (XAML)
Http://msdn.microsoft.com/zh-cn/library/windows/apps/xaml/hh465120.aspx
Supporting apps with background tasks (XAML)
Http://msdn.microsoft.com/zh-cn/library/windows/apps/xaml/hh977056.aspx
Using the file picker (XAML)
Http://msdn.microsoft.com/zh-cn/library/windows/apps/xaml/dn594542.aspx
accessing Data and Files (XAML)
Http://msdn.microsoft.com/zh-cn/library/windows/apps/xaml/hh758319.aspx
Windows Phone Development Reference