点击键盘发出声音小程序，主要是使用了GetAsyncKeyState和Beep API函数的功能，用GetAsyncKeyState函数获得键盘是否按下的状态信息，Beep函数演示了使用PC内部喇叭按音阶发出声音。-Click on the small keyboard sound procedures, mainly the use of the Beep API function GetAsyncKeyState and the function of GetAsyncKeyState function with the keyboard is pressed to obtain status information, Beep function demonstrated by using the PC internal speaker sound scale.