Touch screens should also avoid idioms that involve dragging; single-tap idioms are easier to control and more obvious (when given proper affordance) to novice users.

• 触摸屏还要避免使用普通桌面系统上常见的拖放操作，对于新用户来说，在触摸屏上的单击操作还是相对比较容易和比较明显的，前提是要有明显适当的提示。