在一个450*350的窗体上在下面放置两个按钮“Start”和“Close”,连续点击“Start”按钮会在窗体上显示多个彩色的小球，分别有红、绿、蓝三种颜色，小球不停的跳跃，碰到窗体的边缘则反弹。单击“Close”按钮则关闭整个程序-in a 450* 350 on the Form placed in the following two button "Start" and "Clos e ", consecutive click on the" Start "button in the window showing the various colorful balls, red, green, three colors of blue, the ball kept jumping up and face were on the brink of Form rebound. Click "Close" button to turn off the whole process