cnds

If you want to use CNDs in a system that wants mouse handlers, you need a way to convert CNDs into mouse handlers.

如果想在一个需要鼠标处理程序的系统中使用CND，那么需要有一种方法将CND转换成鼠标处理程序。

CNDs are simpler, because they're more specific to click-and-drag functions and don't bother with any of the information you're not interested in.

CND更为简单，因为它们更特定于点击-拖动功能，并且不必关心不感兴趣的其他信息。

The10() function takes two CNDs and returns a CND that combines them by running them in sequence.

10（）函数以2个CND为参数，并返回一个CND，这个CND将它们组合在一起，使它们依次运行。