procedure TForm1.edtPsdKeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
if(Key = 13) then
btnOK.SetFocus()
else if(Key<48) or (Key >57) then
begin ShowMessage('请输入数字');
edtPsd.Text:='';
end;
end;
end.现在输入不是数字是会清空edit的.如果换个次序
edtPsd.Text:='';
ShowMessage('请输入数字');
就不会清空了?
Shift: TShiftState);
begin
if(Key = 13) then
btnOK.SetFocus()
else if(Key<48) or (Key >57) then
begin ShowMessage('请输入数字');
edtPsd.Text:='';
end;
end;
end.现在输入不是数字是会清空edit的.如果换个次序
edtPsd.Text:='';
ShowMessage('请输入数字');
就不会清空了?
begin
if not (Key in ['0'..'9', #8]) then
begin
Key := #0;
beep;
end;
end;
procedure TForm1.Edit1KeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
beginEdit1.Text := '';
end;为何达到清空文本框的目的?