用api中SetCursorPos函数实现鼠标绕环，本实例为vb版，另有C#版，原理一样，本实例仅对于初学者，所以比较简单。 -SetCursorPos with api functions for the mouse circling in the instance of the vb version, and another C# version of the same principle, only for beginners in this instance, it is relativ