编写程序，该程序通过一个发射按钮可以发射一个弹球，该球遇到边界时会自动弹回，在移动固定次数后，该球停止运动。要求每次点击发射按钮都会发射一个弹球，如果点击多次，则多个弹球同时运动。该程序通过另一个结束可以结束程序的运行。-Write a program, the program can be launched via a button on a pinball launch automatically when the ball bounced back across the border after a fixed number of moves, the ball stops moving. Requires each click the launch button will launch a pinball, if you click multiple times, multiple pinball same movement. The program runs through the other end can end the program.