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procedure TForm1.Edit1MouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
Edit1.SelectAll;
end;
procedure TForm1.edt1KeyPress(Sender: TObject; var Key: Char);
begin
if Key = #13 then //按下回车键
edt1.SelectAll;
end;