一个简单的窗口，点击上面的按钮后可以取得当前所有可视窗口句柄，并显示。 （为了获得点数而制作，希望不会太让你们失望。）-A simple window, click the button above to obtain the current window handle all the visible, and displayed. (In order to get points and production, hope it will not be too let you down.)