模拟钢琴： 程序执行后，创建一个带有模拟钢琴键盘的面板，用户可以通过键盘或者鼠标来“敲击”钢琴键盘发出声音，也可以通过电脑键盘的组合键实现钢琴的高音。-Analog piano: program execution, create a panel with a simulated piano keyboard, the user can via the keyboard or the mouse to " tap" the piano keyboard, voice, or t