unit Unit1_1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls; type TForm1 = class(TForm) Label1: TLabel; Timer1: TTimer; Button1: TButton; procedure Timer1Timer(Sender: TObject); procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.Timer1Timer(Sender: TObject); var DateTime : TDateTime; str:string; begin DateTime := Time; str := TimeToStr(DateTime); label1.Caption := TimeToStr(Time); end; procedure TForm1.Button1Click(Sender: TObject); begin label1.Visible := not Label1.Visible; end; end. 对delphi明白了一点,uses在形式上像#include<> 而type则是定义