//保存上一次的文本来判断呗
//...
TForm1 = class(TForm)
Edit1: TEdit;
procedure Edit1Change(Sender: TObject);
private
{ Private declarations }
FText: string;
public
{ Public declarations }
end;//...procedure TForm1.Edit1Change(Sender: TObject);
begin
if FText <> TEdit(Sender).Text then
ShowMessage('很简单嘛')
else Exit;
FText := TEdit(Sender).Text;
end;
//...
TForm1 = class(TForm)
Edit1: TEdit;
procedure Edit1Change(Sender: TObject);
private
{ Private declarations }
FText: string;
public
{ Public declarations }
end;//...procedure TForm1.Edit1Change(Sender: TObject);
begin
if FText <> TEdit(Sender).Text then
ShowMessage('很简单嘛')
else Exit;
FText := TEdit(Sender).Text;
end;
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