1.先添加一个Timer控件,其Interval属性设置为50. 2.再添加一个Label控件,Name为Label1. 3.然后在Timer的OnTimer事件添加如下代码: unit Unit13; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, jpeg; type TForm13 = class(TF