1.1 The Spatial Relationship in the APP+ 1.2 Judge Where You Are From the Four Elements+ 1.3 The Format Design of APPs+ 1.4 The Design of the Navigation Bar in APPs+ 1.5 The Commonly Used Navigation Patterns in Mobile APPs + 1.6 The Design of App Subpages+ 2.1 The Effects of Device Interface+ 2.2 The Impact of Screen Direction+ 2.3 The Impact Caused by Different Input Modes+ 2.4 Common Operation Interfaces in Apps+ 2.5 Commonly Used Device Interfaces+ 3.1 Gesture Animations+ 3.2 Gesture Animations & The Design Principles for Interface Animations + 3.3 The Common Types of Interface Animation Design+