在Edti输入框里只能输入数字的控制
procedure TMainForm.Edit2KeyPress(Sender: TObject; var Key: Char);
begin
if not (key in ['0'..'9',#8]) then
begin
key := #0;
showmessage('请您勿必输入数字');
end;
end;
procedure TMainForm.Edit2KeyPress(Sender: TObject; var Key: Char);
begin
if not (key in ['0'..'9',#8]) then
begin
key := #0;
showmessage('请您勿必输入数字');
end;
end;