delphi if语法,弹出提示框,不等于写法,判断是否为空
初学Delphi
procedure TFrmLltj.cbb_xxlkChange(Sender: TObject);
begin
if Trim(cbb_xxlk.Text)<>'' then
begin
Showmessage('没空');
end else
Showmessage('空了');
end;
end.
procedure TFrmLltj.cbb_xxlkChange(Sender: TObject);
begin
if Trim(cbb_xxlk.Text)<>'' then
begin
Showmessage('没空');
end else
Showmessage('空了');
end;
end.
if语法:
if .. then
begin
end else
end;
弹出提示框:Showmessage('');
不等于写法:<>
procedure TFrmLltj.cbb_xxlkChange(Sender: TObject);
begin
if Trim(cbb_xxlk.Text)<>'' then
begin
Showmessage('没空');
end else
Showmessage('空了');
end;
end.
procedure TFrmLltj.cbb_xxlkChange(Sender: TObject);
begin
if Trim(cbb_xxlk.Text)<>'' then
begin
Showmessage('没空');
end else
Showmessage('空了');
end;
end.
if语法:
if .. then
begin
end else
end;
弹出提示框:Showmessage('');
不等于写法:<>
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